Lua redirect stdout How do you redirect it back again? The code below shows my intention, but outputs "stdout is p Apr 23, 2014 · @Sam Sure it is, and that is implemented over TCP/IP, a stream. Stdout, os. Effectively utilizing these functions can significantly enhance the functionality and user experience of your Lua applications. console in conf. txt. stdout or stderr a file-like object ; is it the same in Lua with io. -- runs command on a sub-process. Guarantees that ordering between stdout and stderr is precisely in line with the write calls only exist when they're both served by the same file descriptor, and you can't have them served by the same file descriptor while directing their output to different places, even if they're Jan 14, 2014 · I have a program (server) and I am looking for a way (script) that will redirect (or better duplicate) all its stdout to file and add timestamp for each entry. flush() before the close(1) statement to make sure the redirect 'file' file gets the output. Assuming you invoke your script as lua script. Something like this: print_stdout = print -- in case you need the old behavior print = function() for arg,_ in ipairs({}) do -- write arg to any file/stream you want here end end I'm trying to capture and redirect stdout and stderr (using pure Lua) to deliver the output remotely and ran into some problems. I would like to > redirect Lua's stdout to a file, while the real stdout is taken over > by the debug adapter. Therefore io. (which means: redirect stdout to the_file. Feb 8, 2019 · The documentation for redirect_stdouton version 1. 327 1 1 Paul Moore <pf_moore@yahoo. Jan 23, 2017 · Read subprocess stdout line-by-line with readline. How to redirect stdout to file in Lua? 6. write() did not work. popen only returns a handle to stdout for the child process. 0 Lua is not producing output file. None of the above suits my needs. I want to redirect the output of print() to a file of my choosing. The primary use of the freopen function is to change the file associated with a standard text stream (stderr, stdin, or stdout), as those identifiers need not be modifiable lvalues to which the value returned by the fopen function may be assigned. 1 is there a way to redirect stream to stdin in lua Jun 26, 2015 · Lua redirect stdout to console window. exe Where both Some text, and the ou Is there a pure lua way to redirect stdout back into Lua? For example if I have the script: os. Maybe I missed it? I want to capture the output of. Note that redirecting the io library _is not [Feature] Add support to access fields and methods with the same name in Java object when calling Java api from Lua. Oct 19, 2010 · The two streams stdout and stderr may be using the same file descriptor, but before a FILE stream writes any data to its underlying file descriptor, the data is stored in the stream's buffer. This is what I'd recommend as it requires no changes to the script. lua This should go to stdout This should go to stderr Again stdout Again stderr Third stdout Third stderr slitt@mydesk:~$ But now look what happens when you redirect stdin to /dev/null: slitt@mydesk:~$ . 4 here, we see that we can use the operator &> to redirect both stdout and stderr. How to redirect stdout to file in Lua? 0. __bar except that x. output = function(o) iobase. Understanding the `io` Library in Lua. May 6, 2022 · I know a lot of people redirect stdin to input. lua and luajit by writing straight away into stdout with the print function are missing a customization opportunity. DoString("print 'Hello from Lua!'"); Feb 7, 2012 · If the requirement is "quick and dirty" I've found this one useful. Lua Returns the result of executing as string. Dec 11, 2010 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand LuaSocket: LTN12 support. write(text + '\r') sys. txt and redirect stdout to output. If the command you're executing (or the shell, if it can't find the command) writes to stderr, that will come out on the Lua program's stderr. Jan 27, 2017 · we probably want to have all lua console output show up somewhere besides stdout - for example, sending it to remote UI. stdout = setmetatable({mode = "stdout"}, copy) io. Quoting from it's manual: Since a pipe is by definition unidirectional, the type argument may specify only reading or writing, not both; the resulting stream is correspondingly read-only or write-only. 0. May 5, 2012 · Lua redirect stdout to console window. Follow answered Nov 5, 2012 at 19:19. Popen fails if command is a list and contains '&&' or '||' 1. I am successfully able to read and parse the data being sent to stdout. Dec 11, 2018 · I am strugling to get stdout from a lua Script frontend, in the C banckend: type(_ENV. Now both STDOUT and STDERR are going to all_output. lua, the command will become lua script. output(file) to change the output file. for calls to print() in lua, this is easy: redefine print() in lua or in c: Feb 5, 2022 · Generally, I'd recommend the stdout redirection that Donal Fellows suggests in his answer. Oct 14, 2021 · For background, here is the Lua code. Popen('<cmd> 1>&2', stderr=subprocess. stdout) userdata From C, I am doing: lua_getglobal(L,"_G"); lua_pushstring( L, "io" ); lua_gettable( Oct 21, 2008 · The whole process works very well, except for the fact that when I redirect stdin, it does not appear in the redirected stdout the same way it does when the same stdin is typed directly into the console. stdout:setvbuf 'no' -- switch off buffering for stdout AFAIK Lua relies on the underlying C runtime to hook into standard streams, therefore I think the usual guarantees for C standard streams apply. exec 1<&4. popen to write to 2 different variables depending wheter they come from stderr or stdout. popen` write mode to handle command efficiently and sequentially, works asynchronous but could wait for output by middle file. mode]:write("write ", ) end,} copy. exe > out. The documentation of contextlib. However, I cannot get the output of the internal make to be present in both. The ltn12 namespace implements the ideas described in LTN012, Filters sources and sinks. using System; using LuaInterface; namespace Lua1 { class Program { static void Main(string[] args) { Lua lua = new Lua(); lua. lua Newbie here, I am looking for a way to pipe into a shell command and to store the output of the latter in a variable. Nov 12, 2019 · The custom DLL calls CreateThread in DllMain to run a function that creates a new Lua state and runs a Lua script on the victim process. execute("pwd") Can I get the result of calling pwd back as a string in Lua? Part of the text disappeared. May 30, 2015 · You can see that stdout is symlinked to the file I specified on the command line. Why print() in Lua behaving like This? 1. exec 1>bar. If you have a way (in MyReset() I guess) to talk to the running process, perhaps you can engineer a way to pass a new filename for it to (re)open as its stdout, that way. write (and other I/O functions) used Go-side os. Because of this, the output of code formatted for the console does not display correctly in the redirected output. Having thought about this problem I came to some conclusions: 1. The stdio was supplied as a static library, but this library was dependent on another library called SIOUX which implemented the console I/O (no command print("Third stdout") io. -testmode Description This PR implements stdin, stdout, and stderr redirects. stderr:write("Third stderr\n") The preceding code produces the following output: slitt@mydesk:~$ . 5 How to redirect stdout to file in Lua? 2 lua - dofile, how fill stdin from lua? 1 Handling piped io in Lua Nov 26, 2015 · You can redirect stdout, stderr and stdin using freopen. 3 Check if STDIN or STDOUT is a TTY in Lua. it globally, or use freopen () from C to make stdout go elsewhere. local stdout = io. ngx. If you're embedding Lua into your application, make sure you start Lua from a protected call and no panic will ever occur. All solutions I have found do not allow redirecting stdout and stderr from initial host console – Feb 25, 2009 · Why use freopen()?The C89 specification has the answer in one of the endnotes for the section on <stdio. This PR continues the work made by @jtolio at #43 🙏 Changes added initial implementation moved test packages to avoid conflict My enviroment is Window10 using LuaJIT(more precisely LÖVE2D) My goal is to have no terminal visible at all. You need to get inside that process' space to muck with its file descriptors. h&gt; #include &lt;unistd. System. Jun 19, 2014 · @WilliamPursell I'm not sure your clarification improves things :-) How about this: OP is asking if it's possible to direct the called program's stdout to both a file and the calling program's stdout (the latter being the stdout that the called program would inherit if nothing special were done; i. Read console output realtime in lua, take 2. read(size) if not block then break end io. popen which solves the flashing but still leaves a window in the background that gets in the way. stdout = open(log_file, 'w', 0) Once set, any print statements in the script's functions redirect to the log file very nicely. It's not actually my > application as such - I'm writing a plugin for 4NT (cmd. co. The `io` library in Lua is an essential tool for managing input and output operations. A central concept in this model is the file handle, which is equivalent to streams (FILE*) in C: It represents an open file with a current position. This version is standard Lua. All other parts of the Lua source should then call lua_printf rather than just printf. io. Apr 8, 2020 · This solution works as long as only Lua writes on stdout but is not elegant and is not reentrant (I think guess this is the right term). stdout end io. Reading line by line live is a common use case since many CLI utilities produce line-oriented output. Nov 5, 2021 · To support this functionality it would be nice if both print and io. Oct 21, 2008 · The whole process works very well, except for the fact that when I redirect stdin, it does not appear in the redirected stdout the same way it does when the same stdin is typed directly into the console. LTN12. Once the process is started, its stdout is nothing you can change from the outside. 6. Aug 19, 2012 · The idea is to "backup" stdout descriptor, close the original stdout and then redirect strerr to saved stdout. file Jun 20, 2013 · I am implementing Lua functionality in Ncat, which is my Google Summer of Code assignment. exe replacement from > JP Software) which embeds a Lua interpreter into the command line. -bios: Specify a BIOS file. Aug 3, 2021 · From section 3. Nov 23, 2018 · You signed in with another tab or window. uk> wrote: > No, I'm afraid not. I've tried using the code above and debbug it, but have not had any success so far. I need a command that redirects the output of my console to a file, instead of printing it into my shell. The plan is to redirecting stdout to a buffer, sending the buffer to the caller, and then restoring stdout (i can call easily C functions from Lua context). redirect after sending out the headers Is there a straightforward way to add a header value and redirect it somewhere else in Lua? print() uses stdio directly (it calls fputs). As an example of this read pattern, the following program is an efficient way (in Lua, of course) to copy a file from stdin to stdout: local size = 2^13 -- good buffer size (8K) while true do local block = io. 1. Jan 9, 2021 · After the program is already started it's harder to fix unless you're modifying that program's source code to explicitly add the feature, but you can always use a tool like sysdig or (with a much, much larger performance penalty) strace to interactively watch what's being written to /dev/null; sysdig in particular has a "chisel" (a helper script written in lua) that reassembles content into Apr 13, 2018 · The same can be done for stderr. Reload to refresh your session. Sorry if my question wasn't clearer – On 22/08/2008, at 7:44 AM, Wesley Smith wrote: Hi, Is there a pure lua way to redirect stdout back into Lua? For example if I have the script: os. You signed out in another tab or window. txt when debugging, which is actually very convenient. stdout, it doesn't easily generalize to stderr because I can pass only one of stdout or stderr to the file= parameter in tqdm's __init__. What is the purpose of "io. write for line in stdin do stdout (line) end save as inout. h&gt; #include &lt;stdlib. py 1 On Thu, 21 Aug 2008 12:44:58 -0700 "Wesley Smith" <wesley. write(block) end Feb 28, 2017 · @AriSeyhun do you know of a sollution that also allows redirecting output from command line like : myapp. you cannot > redirect stdout easily to catch Lua output. Therefore I want to redirect stdout and stderr to a (the same) file. PIPE) Any solution using freopen is wrong, as it does not allow you to restore the original stdout. -run: Begin execution immediately on startup. I don't want to use run or communicate() because, as I said, I want to do other things while the process is running. For more control over I/O, you can use the complete model. br> writes: >The Lua core does not use stdio, except for sprintf. stdout) userdata From C, I am doing: lua_getglobal(L,"_G"); lua_pushstring( L, "io" ); lua_gettable( If the command you're executing (or the shell, if it can't find the command) writes to stderr, that will come out on the Lua program's stderr. Read console output realtime in Jun 30, 2015 · I'm looking to modify a request header and redirect it in Lua, I've tried. Assuming you are trying to redirect your stdout to a file 'output. Also, you can use a tempfile. -lua_stdout: Redirect Lua's console output to stdout. local handle = io. If you want to reroute this output, you can start a tee process, symlink the stdout of the process you're watching to a the stdin of the new process. Something like the example that follows. _bar and x. The following code redirect all thread output to a single file - int fd = open(<filename_threadid. And for your purpose, you want to ideally just push your stdout through the TCP/IP connection unchanged. redirect("/") and . 0, that I am currently using, does not seem to give an example of how to use that function. From the above link: /* freopen example: redirecting stdout */ #include <stdio. Because of the recursion it can print nested tables too. I have a function that writes to stdout. redirection to terminal rather than file)? I hope to be able to employ just the environment with contextlib. And than output it again to the stdout. I've done some research and the furthest I could get was thanks to How to add timestamp to STDERR redirection. So I am thinking of adding fields in lua_State > that will hold stdin/stdout file descriptors that Lua should use - so > that I can set these to alternative file descriptors. If you want to direct it elsewhere than stdout, you need to redefine it globally, or use freopen() from C to make stdout go elsewhere. h&gt; #include &lt;string. I'm writing a standalone application (Win32 windowed) which integrates the LUA interpreter; the application uses LUA to export some features and I want to show console output in a separated window. output() function and opening the desired file in write mode. __index = copy io. log echo Some text a. Unless otherwise stated, all I/O functions return 1 on success and nil on failure. Share. cmd suppress output in Elixir. txt", "a+", stdout); Here "a+" for append mode. ie. Stderr, os. If the amount of data is expected to be small, the freopen/setbuf thing works fine. lua >file. Now why doesn't cat work? Your command redirects only stdout. All I/O operations in Lua are done over two current files, one for reading and one for writing. The problem I was thinking of was one that used to occur with CodeWarrior on classic MacOS. h&gt; #include &lt;sys/types. If the file exists then the file open in append mode. Thanks in advance for suggestions. Read data before executing lua file. output, stdout = io. '<cmd> 1>&2' should do it. capture("sudo pwrstat -status | grep 'Battery Capacity' | cut -d ' ' -f 3", false) --make sure you have rule in /etc/sudoers to run this pwrstat without password (NOPASSWD) I have the second option of the os. How to make io. Aug 7, 2009 · if possible, redirect one end of the stream (input or output) to a file. There is a third-party API (which I cannot modify) containing a function that prints out a serialized set of data (I do In Lua, you can redirect the standard output (stdout) to a file by using the io. If you use a DLL, you should have some sort of return codes from its function and not relay on its output on stdout. Nov 15, 2012 · Is there a way to redirect stdout and stderr for a batch file from inside it. As a part of the project, I need to port the standard its input/output redirection mechanism to make it as compatible with the POSIX version as possible. local iobase = { output = io. How to clear stdout line in Lua? 1. - robertlzj/LuaExecuteCommandPipe Mar 18, 2014 · not just "afterwards", but even recombining later in a running pipeline discards (some) ordering information. I can do this locally, but would such a change be considered for inclusion in the next release of Lua? Redirecting stdin/stdout/stderr in embedded environment, Paul Moore; Re: Redirecting stdin/stdout/stderr in embedded environment, Paul Moore; Prev by Date: Re: Userdata memory is not freed; Next by Date: Re: Redirecting stdin/stdout/stderr in embedded environment; Previous by thread: Re: Redirecting stdin/stdout/stderr in embedded environment Lua redirect stdout to console window. Sometimes this may not possible. std::freopen closes the old file descriptor, so we have to duplicate it and keep it separate from our evil redirection. The later only returns the exit status not the output. With a bit of tuning this is probably a better solution than my use of /usr/bin/stat because it is more portable (only depends on POSIX features of a common scripting language rather than a Unix/Linux-centric utility that may not be Apr 6, 2022 · The loop won't affect that, but if you want all four lines at once you should be using the -raw switch on Get-Content. Aug 10, 2012 · If your Lua code is going to be using print to output stuff, then I guess the simplest way is to redefine print from Lua itself. txt","w",stdout); printf ("This sentence is redirected to a file. By the way, in my opinion, this would be a totally wrong approach. May 25, 2009 · If this is a 'built-in' feature rather than a temporary thing for testing, you might want to use the C functions on the stdout file descriptor rather than the device node as the C standard is a bit more hardy than the POSIX standard imho. read() return a string? 0. exe c. popen" function? 0. Lua is not producing output file. Lua offers io. It doesn't give the prettiest formatting in the output but for such a simple function it's hard to beat for debugging. Lua save string to file. Jan 29, 2015 · In that way, you can just redirect the stdout/stderr pipes to your process and do whatever you want. And restore saved stdout. lua to: Jul 16, 2013 · The problem is the Lua script: it handles stdout only with standard C functions, so i have to find a solution for «hijacking» its standard output. 1) to a file instead of to console. 5. Lua list <lua@bazar2. stdout sys. reredirect also provide a script called relink that allows to redirect to current terminal: relink PID relink PID | grep useful_content lua_RedirectIO(my_stdin, my_stdout, my_stderr); I specifically don't want to overwrite (in particular, close) the original stdin/out/err, as that causes other issues with the hosting While dealing with redirecting output to a file you may use freopen(). Oct 10, 2018 · There is plenty of documentation about redirecting stdout and stderr to a file instead of the console. My questions are here. Dec 18, 2015 · I'm writing a program to execute another program as a forked process and redirect it's output to a file or /dev/null on demand. cout goes to stdout, but redirecting cout will not redirect all stdout. Dec 1, 2010 · Everything is working fine, except in visual Studio's debug mode, the Lua's print function does not get written to the console (nor to Output). popen("somecommand 2>&1") If the command reads from stdin, it will read from the Lua program's stdin. You can reroute basically anything you want Dec 23, 2020 · How to redirect stdout to file in Lua? 2. Jun 28, 2012 · C language is used. Jan 30, 2021 · Use context_lib and redirect_stdout; Reassign sys. 0 Python Popen using PIPE issue Dec 8, 2013 · The only place where Lua writes to stderr is in the panic function that luaL_newstate installs. If you want to change it, you can simply link it to something else. Redirecting stdin/stdout/stderr in embedded environment, Paul Moore; Prev by Date: Redirecting stdin/stdout/stderr in embedded environment; Next by Date: Re: Suggestion: upvalues to C hook functions; Previous by thread: Redirecting stdin/stdout/stderr in embedded environment; Next by thread: Re: Redirecting stdin/stdout/stderr in embedded Jul 25, 2018 · Lua redirect stdout to console window. Lua. This manual simply describes the functions. 116. So I want to start Redirect stdout. (I know I can do "$ lua program. write() _is_ affected if you use io. For capfd and redirect_stdout you just shift around what you do right before and right after run_string. I think that implementing redirection by passing special characters(<, >, |) as arguments of the debugger is not a very graceful solution, but that method itself should not be eliminated. "); fclose (stdout); return 0; } You can also run your program via command prompt like so: The cmd is not the part that's not working. txt", but I need to create several output files. > With respect to the output stream problem on Windows. stdout():write() From the reference, it looks like print() calls io. exe Oct 24, 2013 · How to redirect stdout to file in Lua? 0. It only appears on my terminal screen. That will read the entire file, then it can be passed to the ForEach-Object loop where all four lines will be written to the host and passed at once to data_processor. stdout:setvbuf 'no'" $(FileName) (who did not try to redirect stdout and miss a couple of lines because of the buffering) use Lua `io. (2) to forfeit stdout and redirect stderr to stdout. 2 Why the lua function io. popen uses the popen(3) function. Jul 14, 2016 · You cannot get stdout to print unbuffered to a pipe (unless you can rewrite the program that prints to stdout), so here is my solution: Redirect stdout to sterr, which is not buffered. It changes them dynamically. Re: Redirecting stdin/stdout/stderr in embedded environment, Thomas Lauer; References: Redirecting stdin/stdout/stderr in embedded environment, Paul Moore; Re: Redirecting stdin/stdout/stderr in embedded environment, Paul Moore; Re: Redirecting stdin/stdout/stderr in embedded environment, Mark Edgar Aug 20, 2023 · Simply redirect stdout to a file using >file. popen('cmd') -- reads command output. It provides functions to handle files and standard input/output in an intuitive way. Initially, the current input file is stdin, and the current output file is stdout. I strongly suggest some beginner friendly Linux distibution like Pop_OS!, Ubuntu or else for serious development efforts as the constant starting and quitting of X-Plane to catch Lua syntax errors on Windows becomes really annoying very Aug 10, 2012 · I need help sending the output (stdin and stdout) from system commands to a bash function, while still accepting input from arguments. Lua - popen command with multiple double quotes. I tried the following Mar 24, 2022 · @apn's suggestion with redirecting stdout works on Windows 11, although any relevant output is indeed only written to the output file when X-Plane is closed. local output = handle:read('*a') -- replaces any newline with a space local format = output:gsub('[\n\r]', ' ') Feb 13, 2019 · Lua redirect stdout to console window. Oct 1, 2021 · How to redirect stdout to file in Lua? 1 Handling piped io in Lua. Jul 8, 2019 · I'm creating a Windows service, which cannot have an associated console. Maybe the Tcl interpreter is linked into a complex application that has itself a fancy idea of where the output should go to, and then you don't know how to restore the stdout channel. readfrom (filename) Same thing works for cerr and clog, but in my experience that will NOT work for stdout/stderr in general, so printf won't output there. Jan 13, 2011 · Insert a sys. I'm trying to make a code in Lua to read a file containing a morse encryption chart, read a file containing a message and then decrypt it and print it in the stdout. Jan 3, 2012 · Lua only depends on ANSI C features. exec("/") but I'm getting following error: attempt to call ngx. Dump the protobuf schemas for PCSX-Redux on stdout and exit immediately. Just like you show structured, readable output on the terminal using the underlying stream stdout. Does someone know how to achieve this ? Is it possible to keep Lua core librairies "as is", or do I have to change the implementation (e. . h&gt; int main(int argc, char* a May 26, 2014 · Yes, the st_mode bit S_IFIFO (010000 octal = 4096 decimal) does the trick, and by checking for st_ino == 0 you can eliminate redirection to named pipes as well. h> int main () { freopen ("myfile. You can trap these. Hi. com> wrote: > I may be re-spawning an ancient topic but I was not able to retrieve clear Mar 13, 2012 · If supported on your system, io. Sep 3, 2015 · In Python 2, my quick solution to allow tailing/viewing of the log as it progressed was by assigning sys. stdout ? Does it work in all cases ? Aug 30, 2013 · io. (3) merge stdout and stderr using XP redirection tricks. vladz vladz. stdout } local copy = { write = function(self, ) iobase[self. Feb 26, 2019 · Lua redirect stdout to console window. Sample program: Same thing works for cerr and clog, but in my experience that will NOT work for stdout/stderr in general, so printf won't output there. So far, I have tried: func 2>&1 | tee output. output() to redirect the io library's default output file away from stdout. hoke@gmail. Suppose for instance I want to replace each "h" by "H" using sed (I know I could do this much easier within lua, this is just a toy problem) and want to pipe some string, say "hello", into it. Feb 7, 2014 · I workin' with Torch7 and Lua programming languages. exe. __bar is harder to get at, debugging wise due to name-mangling. For example, in Linux, when you type: The implicit file descriptors happen to start off set to stdin and stdout, but can be changed. log` # then redirect STDERR to STDOUT (which goes to the file now) python hello. Popen does not work with stdout . h>:. 21. Why the lua function reredirect README also explains how to restore original state of process, how to redirect to another command or to redirect only stdout or stderr. 3. The problem is that io. write() calls io. the terminal, if the calling program is an interactive bash session). Ditto for _INPUT and read. output():write("test 2\n io. execute. /test. g replacing "fprintf" etc. A harder problem is actually being able to use the "old" stdout again, after it was reopened. This would require changing script. So I am thinking of adding fields in lua_State that will hold stdin/stdout file descriptors that Lua should use - so that I can set these to alternative file descriptors. -stdout: Redirect log output to stdout. 1. Here's an example: print () uses stdio directly (it calls fputs). Function in Lua is a first-class type so it is treated equally as other types like number or string, thus making keys in the Lua table must be different whatever types of the values are. stdout manually to an explicit file, then read this file to get output; Here's roughly what the code looks like. Otherwise a new file is created. I'm imagining something like set STDOUT=stdout. Open the process as follows: myproc = subprocess. log # Redirect STDOUT to `all_output. my current quick solution was to enable t. It works fine as long as I don't redirect stdout. Currently I have forked and executed the external program using exe May 22, 2012 · Here's a program I'm trying to make: #include &lt;stdio. 1 Lua Read File and Write to New File. Any solution by assignment to stdout is wrong, as stdout is not an lvalue (it's a macro that expands to an expression of type FILE *). -logfile: Specify a file to log output to. stdout. lua and do Re: Redirecting stdout and stderr, Sam Roberts; References: Redirecting stdout and stderr, Paul K; Prev by Date: Re: Hashing on more than one attribute? Next by Date: Re: Idea about recurse pattern matching (%r) Previous by thread: Redirecting stdout and stderr; Next by thread: Re: Redirecting stdout and stderr; Index(es): Date; Thread May 5, 2019 · Lua redirect stdout to console window. I would like to redirect Lua's stdout to a file, while the real stdout is taken over by the debug adapter. You switched accounts on another tab or window. e. lua - dofile, how fill stdin from lua? 1. txt' then you can write-freopen("output. redirect_stdout() doesn't help me either. Nov 19, 2014 · I'm trying to redirect stdout in Lua (5. Paul Moore wrote: Maybe the simplest way would be a small tweak to liolib. Stdin streams so they can be easily redirected to the graphical component. Mar 1, 2020 · How to redirect stdout to file in Lua? 1. Thus, to redirect both the stderr and stdout output of any command to \dev\null (which deletes the output), we simply type $ command &> /dev/null or in case of my example: $ (echo "stdout"; echo "stderror" >&2) &>/dev/null Sep 25, 2008 · I used this to get percent power left for some proprietary UPS software local curPercent = os. execute("pwd") Can I get the result of calling pwd back as a string in Lua? If there's not a pure Lua way, are there any modules out there that redirect stdout? thanks, wes Sep 7, 2019 · You can also redirect one stream to another. 2 for EPOC that ACTUALLY WORKS; Next by thread: Re: Redirecting stdin/stdout/stderr in embedded While this doc shows how to redirect sys. At least, that was my experience. lua On Thu, May 26, 2011 at 9:28 AM, Cuero Bugot <cbugot@sierrawireless. In this example, we first redirect STDOUT (1) to a file, and then we redirect to STDERR (2) to the new address of 1 (the file). flush() How to clear stdout line in lua? I'd do the following but is there a better or a more standard way? Jul 15, 2013 · In Lua, how to print the console output into a file (piping) instead of using the standard output? 1. How can I display the print output of the Lua scripts in a new console window or preferably the existing console window of the injector? The injector is just a Lua script ran through command line to luajit. Please refer to the LTN for a deeper explanation of the functionality provided by this module. There are very few functions that use _OUTPUT: print and write are the only ones that spring to mind. Using this system, the crucial I/O routines would all be collected in one obvious place and would only have to be modified once by anyone having trouble with them. I would like to capture that output, modify it a bit (replacing some strings). write(' ' * 50 + '\r') sys. @kevinarpe - there's no difference between x. lua > output. Once I use exec 1>file, how can I get rid of this? i. Oct 29, 2014 · @ooga: It would say "No such file or directory" if it was /dev/stdout that was the problem (or "Is a directory" is /dev/stdout was mysteriously a directory); the "Not a directory" means that an element on the path is not a directory, and the only elements on the path for which that can be a problem are / and /dev — though I don't think I believe it. Dec 28, 2010 · You can't. now redirect stderr to wherever stdout currently is set the run Lua command to be lua -e "io. output:write(). Nov 24, 2024 · I have no trouble redirecting the output of func to both stdout and a log file. Jul 25, 2011 · I like to redirect output from stdout for each thread to a file. 4. execute("pwd") > > Can I get the result of calling pwd back as a string in Lua? Subject: Re: "Redirecting" stdout, stderr; From: in > order to redirect output from Lua internals and > from Lua scripts. txt>, <flags>) _dup2(fd, 1) How should I restore the original stdout so the next thread can reliably map its stdout to the filename_threadid? Apr 14, 2015 · [EDIT] As to why capturing the output of some commands doesn't work: Some commands (like less) expect a TTY (a true terminal with the capability to move the cursor around, display colors, etc) as stdout. com> wrote: > Hi, > Is there a pure lua way to redirect stdout back into Lua? For example > if I have the script: > > os. Re: Redirecting stdin/stdout/stderr in embedded environment, Paul Moore; Prev by Date: Re: lua bug - loadfile gets stdin confused; Next by Date: Re: Redirecting stdin/stdout/stderr in embedded environment; Previous by thread: [ANN] Lua 5. >>See previous messages. To avoid this, redirect stderr to stdout: local Hnd, ErrStr = io. Dec 24, 2015 · Just to make it clear, it's my first time using the website as a member. For a project I'm doing, I actually had Oct 25, 2015 · not what I meant, I actually want the io. Improve this answer. stdout():write(), and io. Aug 25, 2014 · I know that STDOUT is getting redirected to the file, the output of those commands gets redirected to file. by my own functions ?) In Python it is sufficient to reassign to sys. How can I stop the redirection of STDOUT to file and restore the normal operation of STDOUT (i. In other words, io. If I want to capture stderr apparently I have only two options: (1) to redirect it to a file and then read it back. This will simply redirect the stderr to stdout. stdout to a file object with buffering set to 0: original_stdout = sys. com. stdin/out/err point to. popen is better suited for this use-case than os. 2 – The Complete I/O Model. 2 Python subprocess. lua and use io. stdout:write("test 1\n") -- works io. exe b. lua io writing to specific postion. output(o) return io. mkstemp() file in place of 'file'. conectiva. Those don't work or don't work correctly when you redirect stdout to a pipe or file. It doesn't actually make the variable private, so it doesn't buy you anything, but makes your debugging life more difficult. 2. Here is what I Sep 3, 2015 · In Python 2, my quick solution to allow tailing/viewing of the log as it progressed was by assigning sys. In python in analogous situation I'd probably clear the line before writing to stdout the following way: sys. c to expose a C API for resetting the FILE* handles that io. 1 Capturing output from Popen. Please refer to this question and its accepted answer for the minimal code that illustrates the problem. redirect_stdout(dummy_file): wrapped around my function in order to redirect every console output of this very function to the dummy_file. Lua redirect stdout to console window. Handling piped io in Lua. Its much similar to the solution provided by geirha, but its more explicit (bash coding can easily become very obscured). Oct 1, 2014 · Lua redirect stdout to console window. capture function above set to false so that it'll strip out the newline you normally get. hvvtc orep rglbd sfxgqwa qjfvotc gjor ojf xzyp dox bvdpf