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up vote 4 down vote favorite

Can I use the case statement to handle arguments? So, using -restart I'd like execute "-umount" and "-mount"

#!/bin/bash
case "$1" in
-mount
mount /ip/share1 /local/share1
;;
-umount
umount /ip/share1
;;
-restart
# echo TODO
;;
*)
[...]
esac
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2 Answers 2

up vote 3 down vote accepted

It looks to me like that should work, other than the syntactical quibble of missing )s. I tested this and it behaves correctly..

#/bin/bash
case "$1" in
  "-mount")
    mount /path/to/device /path/to/mountpoint
    ;;
  "-unmount")
    umount /path/to/mountpoint
    ;;
  "-mount")
    "$0" -unmount
    "$0" -remount
    ;;
  *)
    echo "You have failed to specify what to do correctly."
    exit 1
    ;;
esac
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Not good solution: inside "-remount" I don't want rewrite same code of "-mount" and "-umount" (the code above is only an example - real code is more than long). Thanks for help! :-) –  Pol Hallen Nov 25 at 19:24
1  
$0 is the zeroth paramater to a script or function; in this case, the invocation of the script itself. If I invoke a script with ./script foo bar; $0 is "./script", $1 is "foo", and $2 is "bar". –  DopeGhoti Nov 25 at 19:29
4  
Isn't -remount going to recurse indefinitely? –  Izkata Nov 25 at 21:25
1  
in remount you want to: shift ; $0 -unmount "$@" ; $0 -mount "$@" ;; (... so you don t loop on -remount, and you also pass along any remaining parameters) –  Olivier Dulac Nov 25 at 23:50
1  
Valid points all. I suppose I was concentrating more on the question of using case..esac to handle arguments at all. I too would be more inclined to use the functional route if I were authoring such a script. –  DopeGhoti Nov 26 at 22:34
up vote 2 down vote 
#!/bin/bash
unset u
mnt() { ${u+u}mount /ip/share1 ${u-"/local/share1"}; }
case "$1"   in
(-mount)            :;; 
(-umount)  u=        ;;
(-restart) u= mnt    ;;
(*)               ! :;;
esac && mnt

You could use a function as ^above^.

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