Fun with shell code

README.txt

Code broken in all Zsh versions and Bash versions older than 4.3:

% cat ./foo.sh
DISK_LIST=$(for i in $AVAILABLE_DISKS ; do                       
              for file in /dev/disk/by-id/* ; do
                 case "$(realpath $file)" in
                   /dev/"$i") disk_info="${file#/dev/disk/by-id/}" ; break ;;
                           *) disk_info="${file}" ;;
                 esac
              done
              echo "${i}" "${disk_info}"
            done)

% bash -n ./foo.sh
./foo.sh: line 4: syntax error near unexpected token `;;'
./foo.sh: line 4: `                   /dev/"$i") disk_info="${file#/dev/disk/by-id/}" ; break ;;'
% bash --version | head -1
GNU bash, version 3.2.39(1)-release (i486-pc-linux-gnu)

% bash -n ./foo
./foo: line 4: syntax error near unexpected token `;;'
./foo: line 4: `                     /dev/"$i") disk_info="${file#/dev/disk/by-id/}" ; break ;;         
% bash --version | head -1
GNU bash, version 4.2.37(1)-release (x86_64-pc-linux-gnu)

% zsh -n ./foo.sh 
./foo.sh:4: parse error near `;;'
% zsh --version
zsh 5.0.5 (x86_64-pc-linux-gnu)

Works fine in Bash >=4.3, ksh93, mksh + pdksh though:

% bash -n ./foo.sh
% bash --version | head -1
GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)

Change that makes code parseable and executable in any Shell:

% git diff
diff --git a/foo.sh b/foo.sh
index ea3eb84..6491f54 100644
--- a/foo.sh
+++ b/foo.sh
@@ -1,8 +1,8 @@
 DISK_LIST=$(for i in $AVAILABLE_DISKS ; do
               for file in /dev/disk/by-id/* ; do
                  case "$(realpath $file)" in
-                   /dev/"$i") disk_info="${file#/dev/disk/by-id/}" ; break ;;
-                           *) disk_info="${file}" ;;
+                   (/dev/"$i") disk_info="${file#/dev/disk/by-id/}" ; break ;;
+                           (*) disk_info="${file}" ;;
                  esac
               done
               echo "${i}" "${disk_info}"