How to add an extra argument conditionally in bash script?

Question

There\'s a script that calls the other program. The following is program.sh. It might look non-sense but I\'m omitting lots of details and… Let\'s say I wanna s

Answer 1

Use an array.

cmd=(/usr/bin/foo -A -B -C)
if somecond; then
  cmd+=(-X)
fi
"${cmd[@]}"

Answer 2

You could add a conditional. I'm sure there are less repetitive ways to do it but this should work:

#!/bin/bash

function run_this {
    if [[ "$1" = "--quiet" ]]; then
       /usr/bin/foo -A -B -C -X
    else 
       /usr/bin/foo -A -B -C
    fi
}
run_this "$1"