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| (One 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.) 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: | 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: |
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| To do it recursively, you should use a loop, plus the [:UsingFind:find] command: | To do it recursively, you should use a loop, plus the [[UsingFind|find]] command: |
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| For more hints in this direction, see [:BashFAQ/020:FAQ #20]. To see why the `find` command comes after the loop instead of before it, see [:BashFAQ/024:FAQ #24]. | For more hints in this direction, see [[BashFAQ/020|FAQ #20]]. To see why the `find` command comes after the loop instead of before it, see [[BashFAQ/024|FAQ #24]]. |
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"
doneTo 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.