'grep' - search for patterns in files - Video Man Pages

The 'grep' command is used to search for patterns within files.

- Search for pattern within a file:
grep "search pattern" path/to/file

- Search for pattern using "basic" regular expressions (grep's default behavior):
NOTE Supports (^, $, ., [abc], [^abc], [a-z], *, \)
grep -G "search pattern" path/to/file

- Interprets patterns as "extended" regular expressions:
NOTE Supports (?, +, {}, (), and |)
grep -E "search pattern" path/to/file

- Interprets patterns as "fixed strings" rather regular expressions (disables regex):
grep -F "fixed string" path/to/file

- Search for a pattern in all files "recursively" in a directory:
grep -r "some pattern" path/to/dir

- "Ignore" binary files, search "recursively" in a directory, and print file names rather than the normal line output:
grep -Irl "some pattern" path/to/dir

- An inverse search for the pattern (returns lines that DO NOT contain the pattern):
grep -v "some pattern" path/to/file

- Search for pattern, "ignoring" case and adding line "numbers" to the output:
grep -in "some pattern" path/to/file

- Recursively search and do not write anything to standard output ("quiet" mode):
grep -rq "some pattern" path/to/dir

- Recursively search and "suppress" error messages about non-existent or unreadable files:
grep -rs "some pattern" /path/to/dir

- Set a "max" number of matching lines:
grep -m 2 "some pattern" /path/to/file

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