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---- CategoryShell |
How can I run a command on all files with the extension .gz?
Often a command already accepts several files as arguments, e.g.
zcat -- *.gz
On some systems, you would use gzcat instead of zcat. If neither is available, or if you don't care to play guessing games, just use gzip -dc instead.
The -- prevents a filename beginning with a hyphen from causing unexpected results.
If an explicit loop is desired, or if your command does not accept multiple filename arguments in one invocation, the for loop can be used:
# Bourne for file in *.gz do echo "$file" # do something with "$file" done
To do it recursively, you should use a loop, plus the find command:
# Bash while read file; do echo "$file" # do something with "$file" done < <(find . -name '*.gz' -print)
For more hints in this direction, see FAQ #20. To see why the find command comes after the loop instead of before it, see FAQ #24.