I think the following example makes more sense.
The same can be achieved with a command group (code block)
The
is most correct, while all shells also take
.
Last edited by MadeInGermany; 02-17-2019 at 09:03 AM..
This User Gave Thanks to MadeInGermany For This Post:
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)
If I forget to set up stderr redirection on execution of a script, is there a way to set that redirection post-exec? In other words, if I have a script running and no errors are being logged... and then I remember that I forgot the 2>&1 on the script... can I turn it on after the fact?
...and... (1 Reply)
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)
I have a simple script written in awk whose purpose is to go through some php files and replace some strings. Naturally, I want the changes to be written out to the files. The script looks generally as follows:
{
gsub(/'replacethis'/, "with this"); # a bunch of these
print $0 > FILENAME
}... (3 Replies)
% ls -ld /usr /foo
ls: /foo: No such file or directory
drwxr-xr-x 14 root wheel 512 May 18 02:49 /usr
% ls -ld /usr /foo 1>/dev/null/
/dev/null/: Not a directory.
% ls -ld /usr /foo 2>/dev/null/
/dev/null/: Not a directory.
^^Why why why doesn't this work for me. Furthermore, where is... (7 Replies)
I dont know what I am doing wrong but I would like to redirect the stderr output to a file?
the specific command is this
time wget http://www.something.com/somefile.bin
All I want to see is time's output which is stderr so I can see how long the file download took. I've tried redirecting... (2 Replies)
I am trying to redirect the output from stderr to a log file from within a bash script. the script is to long to add 2> $logfile to the end of each command. I have been trying to do it with the command exec 2> $logfile This mostly works. Unfortunately, when a read command requires that anything be... (5 Replies)
I'm not a complete novice at unix but I'm not all that advanced either. I'm hoping that someone with a little more knowledge than myself has the answer I'm looking for.
I'm writing a wrapper script that will be passed user commands from the cron...
Ex:
./mywrapper.sh "/usr/bin/ps -ef |... (1 Reply)
Hi,
I already searched through the forum and tried to find a answer for my problem but I didn't found a full working solution, thats way I start this new thread and hope, some can help out.
I wonder that I'm not able to find a working solution for the following scenario:
Working in bash I... (8 Replies)
Hi folks
I need/want to redirect output (stdout, stderr) from an exec call to separate files. One for stderr only and two(!) different (!) ones for the combined output of stderr and stdout.
After some research and testing i got this so far :
(( exec ${command} ${command_parameters} 3>&1... (6 Replies)
Discussion started by: MDominok
6 Replies
LEARN ABOUT DEBIAN
explain_system_or_die
explain_system_or_die(3) Library Functions Manual explain_system_or_die(3)NAME
explain_system_or_die - execute a shell command and report errors
SYNOPSIS
#include <libexplain/system.h>
void explain_system_or_die(const char *command);
void explain_system_success_or_die(const char *command);
int explain_system_success(const char *command);
DESCRIPTION
These functions may be used to execute commands via the system(3) function, and report the results.
explain_system_or_die
void explain_system_or_die(const char *command);
The explain_system_or_die function is used to call the system(3) system call. On failure an explanation will be printed to stderr,
obtained from explain_system(3), and then the process terminates by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
int status = explain_system_or_die(command);
command The command, exactly as to be passed to the system(3) system call.
Returns:
This function only returns on success, see system(3) for more information. On failure, prints an explanation and exits.
explain_system_success_or_die
void explain_system_success_or_die(const char *command);
The explain_system_success_or_die function is used to call the system(3) system call. On failure, including any exit status other than
EXIT_SUCCESS, an explanation will be printed to stderr, obtained from explain_system(3), and then the process terminates by calling
exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
explain_system_success_or_die(command);
command The command, exactly as to be passed to the system(3) system call.
Returns:
This function only returns on success. On failure, prints an explanation and exits.
explain_system_success
int explain_system_success(const char *command);
The explain_system_success function is used to call the system(3) system call. On failure, including any exit status other than EXIT_SUC-
CESS, an explanation will be printed to stderr, obtained from explain_system(3). However, the priniting of an error message does not also
cause exit(2) to be called.
This function is intended to be used in a fashion similar to the following example:
int status = explain_system_success(command);
command The command, exactly as to be passed to the system(3) system call.
Returns:
the value returned by the system(3) system call. In all cases other than EXIT_SUCCESS, an error message will also have been
printed to stderr.
SEE ALSO system(3)
execute a shell command
explain_system(3)
explain system(3) errors
exit(2) terminate the calling process
COPYRIGHT
libexplain version 0.52
Copyright (C) 2008 Peter Miller
explain_system_or_die(3)