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How to use parameter substitution in glob pattern (zsh)

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linux-howto

http://unix.stackexchange.com – I want to process a bunch of files ending in some suffixes, so I wrote the following zsh script but it did not work. EXT=(.jpg .png .gif) EXT=${(j.|.)EXT} # EXT becomes '.jpg|.png|.gif' for f in *($EXT); do # should become '*(.jpg|.png|.gif)' but failed process-one-file $f done Why doesn't it work? How can I mix parameter substitution and glob pattern? (HowTos)