CODEWITHSUNDEEP
bash
ewok
ewok

Reputation: 21453

bash: in a case statement, go to other case

I'm trying to write a script where I manipulate variables using options, but there are shortcuts if no option is specified. so for example, I have add, show, set, and delete, but if I don't specify any of those, then the input is interpreted to determine which operation to perform:

I'm written a case statement for the options, but in the catchall, is it possible to say "go to case X"?:

case $1 in
    add)
        #blah;;
    show)
        #blah;;
    set)
        #blah;;
    delete)
        #blah;;
    *)
        if [[ $1 == *=* ]]; then
            #go to case "set"
        elif [[ $1 ]]; then
            ##go to case "show"
        else
            echo "FAILURE!!!"
            exit 1
        fi
    esac

EDIT

I came up with:

case $1 in
    add)
        #blah;;
    delete)
        #blah;;
    set|*=*)
        #blah;;
    show|*)
        #blah;;
    esac

Which almost works, but now if there is no last argument (i.e. i just execute script) it will try to run script show.

Upvotes: 3

Views: 847

Answers (3)

anubhava
anubhava

Reputation: 785156

You can use "${1?arg needed}" instead of $1 at the start of case to fail the script when $1 is not supplied.

case "${1?arg needed}" in
   add)
      echo "add";;
   delete)
      echo "delete";;
   set|*=*)
      echo "set";;
   show|*)
      echo "show";;
esac

Testing this:

bash ./script
-bash: 1: arg needed

bash ./script foobar
show

bash ./script abc=123
set

Upvotes: 2

Tom Fenech
Tom Fenech

Reputation: 74615

I would suggest structuring your code like this:

if [[ -z $1 ]]; then
    echo "FAILURE!!!"
    exit 1
fi

case $1 in
    add)
        #blah;;
    set|*=*)
        #blah;;
    delete)
        #blah;;
    show|*)
        #blah;;
esac

i.e. fail before hitting the case statement and use | to combine the patterns for each case.

Upvotes: 4

John Doe
John Doe

Reputation: 364

try: 

case $1 in
    add)
        #blah;;
    show|*)
        #blah;;
    set|*=*)
        #blah;;
    delete)
        #blah;;
    *)
        echo "FAILURE!!!"
        exit 1
    esac

Upvotes: -2

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