I have found this piece of code while studying a bash script:
dir=${0%/*}
I suspect the code inside the braces to be regex but I don't see what it means. Any idea?
In bash, what does dir=${0%/*} means?
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It is not a regex, but it is a pattern match. It sets
dirto the name of the script, which is$0, but without the last slash and any non-slash after it, if there is a slash in$0. If there is no slash in$0,dirgets a copy of$0unchanged. See "Parameter Expansion" in the Bash Hackers Wiki.