Switch case with fallthrough

Question

I am looking for the correct syntax of the switch statement with fallthrough cases in Bash  ideally case-insensitive   In PHP I would program it like   switch  c        case 1          do this            break       case 2       case 3          do what you are supposed to do            break       default          do nothing         I want the same in Bash   case   C  in      1           do this                   2        3           do what you are supposed to do                             do nothing                esac   This somehow doesn t work  function do what you are supposed to do   should be fired when  C is 2 OR 3

User · Answer

If the values are integer then you can use [2-3] or you can use [5,7,8] for non continuous values.

#!/bin/bash
while [ $# -gt 0 ];
do
    case $1 in
    1)
        echo "one"
        ;;
    [2-3])
        echo "two or three"
        ;;
    [4-6])
        echo "four to six"
        ;;
    [7,9])
        echo "seven or nine"
        ;;
    *)
        echo "others"
        ;;
    esac
    shift
done

If the values are string then you can use |.

#!/bin/bash
while [ $# -gt 0 ];
do
    case $1 in
    "one")
        echo "one"
        ;;
    "two" | "three")
        echo "two or three"
        ;;
    *)
        echo "others"
        ;;
    esac
    shift
done

User · Answer

Try this   case  VAR in normal      echo  This doesn t do fallthrough         special      echo -n  This does         amp  fallthrough      echo  fall-through         esac

User · Answer

Recent bash versions allow fall-through by using   amp  in stead of     they also allow resuming the case checks by using    amp  there   for n in 4 14 24 34 do   echo -n   n       case   n  in    3         echo -n thirty-         amp     resume  to find  4 later       24         echo -n twenty-        amp     fallthru     4     13 4       echo -n four          amp     resume   to find teen where needed       14         echo -n teen   esac   echo  done   sample output  4   four 14   fourteen 24   twenty-four 34   thirty-four

User · Answer

Do not use    behind function names in bash unless you like to define them  use  23  in case to match 2 or 3 static string cases should be enclosed by    instead of      If enclosed in     the interpreter  needlessly  tries to expand possible variables in the value before matching     case   C  in  1       do this         23       do what you are supposed to do               do nothing        esac   For case insensitive matching  you can use character classes  like  23     case   C  in    will match C  Abra  and C  abra   Aa  bra       do mysterious things           will match all letter cases at any char like  abra    ABRA  or  AbRa   Aa  Bb  Rr  Aa       do wild mysterious things         esac   But abra didn t hit anytime because it will be matched by the first case    If needed  you can omit    in the first case to continue testing for matches in following cases too      jumps to esac

User · Answer

Use a vertical bar     for  or    case   C  in  1       do this           2     3       do what you are supposed to do                 do nothing          esac

[bash] Switch case with fallthrough?

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