CODEWITHSUNDEEP
bashshell
user121196
user121196

Reputation: 30990

bash script that handles optional arguments

I have a bashscript that expects an optional argument as follows, there are several things that I would like to refine it so that I can pass in the first argument in different ways(0, false to indicate a false value, all other string to indicate true, defaults to false), what's an elegant way to script this? I would like to use if statement with the right boolean expression.

if [ -n "$1" ]; then
    update_httpconf="$1";
fi
if [ "$update_httpconf" = "true" ]; then
    echo "hi";
fi

Upvotes: 5

Views: 2614

Answers (2)

hdgarrood
hdgarrood

Reputation: 2151

If you made it so that making the first argument --update-httpconf counts as true, and anything else counts as false, it would be more consistent with other unixey command line utilities.

This might be a good starting point:

while [ $# -gt 0 ]
do
    case $1 in
        '--update-httpconf')
            update_httpconf=true
            ;;
        *)
            echo "unrecognised arg $1"; exit
            ;;
    esac
    shift
done

Upvotes: 3

twalberg
twalberg

Reputation: 62369

Use a case statement:

case "$1" in
  0|false|FALSE) do_something;;
  *) do_something_else;;
esac

Upvotes: 0

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