shopt Archives - Magenaut

What are the scope restrictions for setting shopt extglob. and other options?

August 8, 2022 by Magenaut

My non-interactive bash shell has extglob off. I would like to turn it on in the statement immediately before a command, but I have noticed that when shopt -s extglob is within an if .. then .. else block, it somehow does not register.

Set and Shopt – Why Two?

August 7, 2022 by Magenaut

set and shopt are both shell builtins that control various options. I often forget which options are set by which command, and which option sets/unsets (set -o/+o, shopt -s/-u). Why are there two different commands that seemingly do the same thing (and have different arguments to do so)? Is there any easy way/mnemonic to remember which options go with which command?