Writing try catch finally in shell

Question

Is there a linux bash command like the java try catch finally? Or does the linux shell always go on?

try {    `executeCommandWhichCanFail`    mv output } catch {     mv log } finally {     rm tmp } 

Answer 1

Based on your example, it looks like you are trying to do something akin to always deleting a temporary file, regardless of how a script exits. In Bash to do this try the trap builtin command to trap the EXIT signal.

#!/bin/bash  trap 'rm tmp' EXIT  if executeCommandWhichCanFail; then     mv output else     mv log     exit 1 #Exit with failure fi  exit 0 #Exit with success 

The rm tmp statement in the trap is always executed when the script exits, so the file "tmp" will always tried to be deleted.

Installed traps can also be reset; a call to trap with only a signal name will reset the signal handler.

trap EXIT 

For more details, see the bash manual page: man bash