How to Suppress Standard Output and Error Message in Linux

Sometime while debugging a shell script, you may not want to see either the
standard output or standard error message. Use /dev/null as shown below for
suppressing the output.

Suppress standard output using > /dev/null
This will be very helpful when you are debugging shell scripts, where you
don’t want to display the echo statement and interested in only looking at
the error messages.

# cat file.txt > /dev/null
# ./shell-script.sh > /dev/null

Suppress standard error using 2> /dev/null
This is also helpful when you are interested in viewing only the standard
output and don’t want to view the error messages.

# cat invalid-file-name.txt 2> /dev/null
# ./shell-script.sh 2> /dev/null