How to silence output of all commands in a Bash script?

You can use the exec command to redirect everything for the rest of the script.

You can use 3>&1 to save the old stdout stream on FD 3, so you can redirect output to that if you want to see the output.

exec 3>&1 &>/dev/null
some_command
another_command
command_you_want_to_see >&3
command3