シェルスクリプトでtry-catch-finally ref: http://qiita.com/ryo0301/items/7bf1eaf00b037c38e2ea

file0.txt

#!/bin/sh

set -eu

trap catch ERR
trap finally EXIT

function catch {
    echo CATCH
}
function finally {
    echo FINALLY
}

echo pre
cd $1
echo post

exit 0

file1.txt

$ ./test.sh /
pre
post
FINALLY

file2.txt

$ ./test.sh /root
pre
./test.sh: line 16: cd: /root: 許可がありません
CATCH
FINALLY