bash-shell-base/function/comment

#!/bin/bash
function comment() {
    [[ $# -lt 2 ]] && echo must supply pattern and file && return 1
    sed -i '/'$1'/s/^#*/#/g' "$2"
}

function uncomment() {
    [[ $# -lt 2 ]] && echo must supply pattern and file && return 1
    sed -i '/'$1'/s/^#*//g' "$2"
}