grep
Find patterns in files using regular expressions. More information: https://www.gnu.org/software/grep/manual/grep.html.
- Search for a pattern within a file:
grep "
search_pattern"
path/to/file
- Search for an exact string (disables regular expressions):
grep
-F|–fixed-strings "
exact_string"
path/to/file
- Search for a pattern in all files recursively in a directory, showing line numbers of matches, ignoring binary files:
grep
-r|–recursive
-n|–line-number --binary-files
without-match "
search_pattern"
path/to/directory
- Use extended regular expressions (supports
?
,+
,{}
,()
, and|
), in case-insensitive mode:
grep
-E|–extended-regexp
-i|–ignore-case "
search_pattern"
path/to/file
- Print 3 lines of context around, before, or after each match:
grep --
context|before-context|after-context 3 "
search_pattern"
path/to/file
- Print file name and line number for each match with color output:
grep
-H|–with-filename
-n|–line-number --color=always "
search_pattern"
path/to/file
- Search for lines matching a pattern, printing only the matched text:
grep
-o|–only-matching "
search_pattern"
path/to/file
- Search
stdin
for lines that do not match a pattern:
cat
path/to/file | grep
-v|–invert-match "
search_pattern"