Question

Possibly this question seems stupid but anyway. I have a script file /local/bin/app1/script.sh and I need to know its parents parent directory name bin. I know that I can use ${0%/*} to determine the parent directory name. I’m not familiar with bash so could somebody please help me to figure out parents parent directory name? Many thanks.

Answer 1

Just apply the trick once more:

parent=${0%/*}
grandparent=${parent%/*}

Or, let the shell tell you

( cd ../.. ; pwd )