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| [[Anchor(faq15)]] == How can I run a command on all files with the extention .gz? == |
<<Anchor(faq15)>> == How can I run a command on all files with the extension .gz? == |
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| zcat *.gz | zcat -- *.gz |
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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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| for file in *.gz | # Bourne for file in ./*.gz |
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| To do it recursively, you should use a loop, plus the find command: | To do it recursively, use [[UsingFind|find]]: |
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| while read file; do echo "$file" # do something with "$file" |
# Bourne find . -name '*.gz' -type f -exec do-something {} \; }}} If you need to process the files inside your shell for some reason, then read the `find` results in a loop: {{{ # Bash while IFS= read -r file; do echo "Now processing $file" # do something fancy with "$file" |
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| For more hints in this direction, see [#faq20 FAQ #20], below. To see why the find command comes after the loop instead of before it, see [#faq24 FAQ #24]. | This example uses ProcessSubstitution (see also [[BashFAQ/024|FAQ #24]]), although a pipe may also be suitable in many cases. However, it does not correctly handle filenames that contain newlines. To handle arbitrary filenames, see [[BashFAQ/020|FAQ #20]]. ---- 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"
doneTo do it recursively, use find:
# Bourne
find . -name '*.gz' -type f -exec do-something {} \;If you need to process the files inside your shell for some reason, then read the find results in a loop:
# Bash
while IFS= read -r file; do
echo "Now processing $file"
# do something fancy with "$file"
done < <(find . -name '*.gz' -print)This example uses ProcessSubstitution (see also FAQ #24), although a pipe may also be suitable in many cases. However, it does not correctly handle filenames that contain newlines. To handle arbitrary filenames, see FAQ #20.