Redirect all output in shell script to a file

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Redirecting a single command in a script to a file is straight-forward using the > syntax. For example, to redirect all STDERR output:

1	echo "hello, world" 2>> /tmp/filename.log

To redirect all lines of a Bash script to a file, add a scope around all of the lines and then redirect the scope to a file. For example:

(
echo "this is line 1 of my script"
cat /proc/cpuinfo
dmesg
echo "this is the end of my script"
) 2>> /tmp/filename.log

This allows you to capture all output of a script without having to append the redirection to each line.

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