Unix/Linux redirection FAQ: How do I redirect Unix STDOUT and STDERR to the same file with one command?
To redirect both STDOUT and STDERR to the same file with one Unix/Linux command, use this syntax:
my-shell-script.sh > /dev/null 2>&1
As you can see in this command, I'm redirecting STDOUT to /dev/null as normal, and then the special
2>&1 syntax tells your Bash shell to redirect STDERR to STDOUT (which is already pointing to /dev/null).
You don't have to redirect your output to /dev/null, you can redirect it to a log file if you need to, something like this:
my-script.sh > logfile 2>&1
I use this technique to redirect STDOUT and STDERR in many Unix shell scripts and crontab entries, and occasionally from the Unix command line, as I just did now to create a combined STDOUT/STDERR log file to debug a problem I'm having.
Redirect STDOUT/STDERR at the same time - Summary
I hope this tip on how to redirect Unix/Linux STDOUT and STDERR to the same file has been helpful. As usual, if you have any questions or comments, leave a note in the Comments section below.
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