3 ms·
The only thing to keep in mind about Zsh parameter expansion is that unquoted empty values will be dropped entirely, while quoted empty values will be treated l
by nerdponx 4y ago
The only thing to keep in mind about Zsh parameter expansion is that unquoted empty values will be dropped entirely, while quoted empty values will be treated like the empty string '':
show_nargs() { print $# }
q=
show_nargs $q # 0
show_nargs "$q" # 1
So it doesn't completely solve the need for defensive quoting, but at least it mitigates the need for the most part.
- BoppreH 4y agoOuch, that is a sharp corner: $ echo 'aaa' > a.txt $ echo 'bbb' > b.txt $ TMP_DIR="" # Mistake! Missing arg, failed search, typo'd name, etc. $ cp a.txt b.txt $TMP_DIR $ cat b.txt aaa $ # The contents of b.txt are lost.
- nextaccountic 4y agocp itself should have been two commands, or at least accept two flags for those two very different semantics. Actually there's a wave of unixy tools being written in Go and Rust and I think there might be a suitable cp replacement already, but it's up to distros to package it.