extglob (extended pattern matching bash)
Sometimes you want to match filenames but the standard shell
expansion won't do it. For example, you want all the files
but not the ones that end with .bak - there's no easy way
to do that with standard wildcards, but bash can turn on
"extended globbing". You do that with " shopt -s extglob".
With that in place, you can do things like:
# everything but .html, .jpg or ,gif files
ls -d !(*.html|*gif|*jpg)
# list file9, file22 but not fileit
# begins with apl or un only
ls -d +(apl*|un*)
The lead-in characters recognized when extglob is set are (from
the man page):
Matches zero or one occurrence of the given patterns
Matches zero or more occurrences of the given patterns
Matches one or more occurrences of the given patterns
Matches exactly one of the given patterns
Matches anything except one of the given patterns
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