Difference between revisions of "Grep"
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(Created page with "==grep with find== Given the common <code>grep</code> command <syntaxhighlight lang=bash> grep -R 'pattern' * </syntaxhighlight> a corresponding <code>find -exec</code> com...") |
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| + | ==Include or exclude filename of matched file== | ||
| + | |||
| + | -H, --with-filename # Default if there are multiple files to search | ||
| + | -h, --no-filename # Default if there is only one file to search (or stdin) | ||
| + | |||
==grep with find== | ==grep with find== | ||
| Line 10: | Line 15: | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
| − | find … -exec grep - | + | find … -exec grep -HR 'pattern' {} \; |
| + | </syntaxhighlight> | ||
| + | |||
| + | If necessary, use the command from [[Find#Sorting_by_mtime]] to search on files in date order: | ||
| + | |||
| + | <syntaxhighlight lang=bash> | ||
| + | find … -printf '%T@ %p\0' | sort -zk 1n | sed -z 's/^[^ ]* //' | xargs -0i grep -HR 'pattern' {} | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | <syntaxhighlight lang=bash> | ||
| + | find … -printf '%T@ %p\0' | | ||
| + | sort -zk 1n | # 1n for oldest first, 1nr for newest first | ||
| + | sed -z 's/^[^ ]* //' | | ||
| + | xargs -0i grep -HR 'pattern' {} | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | ===List files containing STRING in first SIZE bytes of the file=== | ||
| + | |||
| + | <syntaxhighlight lang=bash> | ||
| + | find … -type f -exec \ | ||
| + | bash -c ' | ||
| + | grep -q "STRING" < <(head -c SIZE "$1") && | ||
| + | printf '%s' "$1" && | ||
| + | echo | ||
| + | ' _ {} \; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Latest revision as of 04:25, 17 August 2017
Include or exclude filename of matched file
-H, --with-filename # Default if there are multiple files to search -h, --no-filename # Default if there is only one file to search (or stdin)
grep with find
Given the common grep command
grep -R 'pattern' *
a corresponding find -exec command should add -H to include the filename prefix in the results. (This is needed because the filenames are given one at a time.)
find … -exec grep -HR 'pattern' {} \;
If necessary, use the command from Find#Sorting_by_mtime to search on files in date order:
find … -printf '%T@ %p\0' | sort -zk 1n | sed -z 's/^[^ ]* //' | xargs -0i grep -HR 'pattern' {}
find … -printf '%T@ %p\0' |
sort -zk 1n | # 1n for oldest first, 1nr for newest first
sed -z 's/^[^ ]* //' |
xargs -0i grep -HR 'pattern' {}
List files containing STRING in first SIZE bytes of the file
find … -type f -exec \
bash -c '
grep -q "STRING" < <(head -c SIZE "$1") &&
printf '%s' "$1" &&
echo
' _ {} \;
