I have a C program that continously outputs info to stdout. The problem is that I am redirecting the stdout and stderr to a file and stdout is written at the end of the problem rather than continously to the file. This could be a problem if for example the program is killed and the stdout output is lost. On the other hand, stderr is written continuously to the file.
Thats the way I am doing the redirection of the stdout and stderr.
Any ideas how can I redirect the stdout to the file continuously rather than at the end of the program?
Last edited by methyl; 06-26-2012 at 06:40 PM..
Reason: please use code tags
In bash, I need to send the STDOUT and STDERR from a command to one file, and then just STDERR to another file. Doing one or the other using redirects is easy, but trying to do both at once is a bit tricky. Anyone have any ideas? (9 Replies)
Friends
I have to redirect STDERR messages both to screen and also capture the same in a file.
2 > &1 | tee file works but it also displays the non error messages to file, while i only need error messages.
Can anyone help?? (10 Replies)
Is there a way to redirect all stdout to a file implicitly - like defining stdout=/home/me/process.log - so that all "echo" commands in several scripts/subscripts are written to that file; instead of having to edit all scripts to redirect the "echo" (e.g. echo 'This is a test ' >>... (1 Reply)
I have an executable that, depending on its input, outputs to either one file or several. It usually prints nothing on screen. The usual way to call this program is to specify an input and output filenames, like this:
./executable.exe -i inputfile -o outputfileIt will then try to use the output... (1 Reply)
Hi everybody,
I am trying to do the thing you see in the title, and I can't simply do
a=$(svn up)
echo $a
because the program (svn) gives output on lots of lines and in the variable the output is stored on only one line (resulting in a horribly formatted text). Any tips?
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Hello,
I have a script (videostream.sh) which invokes the GStreamer command-line tool gst-launch with all the correct command line parameters. When I invoke this program, I add the '&' character at the end to make it a background task, so that my script can complete and exit, i.e.
gst-launch... (1 Reply)
I have a simple bash script that prints sth every 5 seconds. What I do is the following. I redirect the output of the script to a file, tail the file and see that it works and then from another console I delete the file where the output is redirected to. Even though I have deleted the file, the... (2 Replies)
Hello all. I've been lurking here for a year or two and finally decided to post.
I need some assistance with file descriptors, stdout, and redirecting output. I've searched through a number of very helpful threads here (unfortunately I can't link to any of them yet due to my low post count...),... (2 Replies)
I have to redirect STDERR messages both to screen and also capture the same in a file but STDOUT only to the same file.
I have searched in this formum for a solution, but something like
srcipt 3>&1 >&2 2>&3 3>&- | tee errs
doesn't work for me...
Has anyone an idea??? (18 Replies)
Hello,
I'm strugling with some redirecting and all help is apreciated.
The following program is working as expected, but the result of the AT command doesn't go to any file.
Thanks in advance for the help.
#!/bin/bash
modem=/dev/ttyUSB1
file=/root/imsi.txt
# print error to stderr and exit... (4 Replies)
Discussion started by: cleitao
4 Replies
LEARN ABOUT LINUX
annotate-output
ANNOTATE-OUTPUT(1) General Commands Manual ANNOTATE-OUTPUT(1)NAME
annotate-output - annotate program output with time and stream
SYNOPSIS
annotate-output [options] program [args ...]
DESCRIPTION
annotate-output will execute the specified program, while prepending every line with the current time and O for stdout and E for stderr.
OPTIONS
+FORMAT
Controls the timestamp format, as per date(1). Defaults to "%H:%M:%S".
-h, --help
Display a help message and exit successfully.
EXAMPLE
$ annotate-output make
21:41:21 I: Started make
21:41:21 O: gcc -Wall program.c
21:43:18 E: program.c: Couldn't compile, and took me ages to find out
21:43:19 E: collect2: ld returned 1 exit status
21:43:19 E: make: *** [all] Error 1
21:43:19 I: Finished with exitcode 2
BUGS
Since stdout and stderr are processed in parallel, it can happen that some lines received on stdout will show up before later-printed
stderr lines (and vice-versa).
This is unfortunately very hard to fix with the current annotation strategy. A fix would involve switching to PTRACE'ing the process.
Giving nice a (much) higher priority over the executed program could however cause this behaviour to show up less frequently.
The program does not work as well when the output is not linewise. In particular, when an interactive program asks for input, the question
might not be shown until after you have answered it. This will give the impression that the annotated program has hung, while it has not.
SEE ALSO date(1)SUPPORT
This program is community-supported (meaning: you'll need to fix it yourself). Patches are however appreciated, as is any feedback (posi-
tive or negative).
AUTHOR
annotate-output was written by Jeroen van Wolffelaar <jeroen@wolffelaar.nl> This manpage comes under the same copyright as annotate-output
itself, read /usr/bin/annotate-output (or wherever you install it) for the details.
DEBIAN Debian Utilities ANNOTATE-OUTPUT(1)