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grep

Find patterns in files using regular expressions.

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• Search for a pattern within a file:

grep "{search_pattern}" {path/to/file}

• Search for an exact string (disables regular expressions):

grep --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 --recursive --line-number --binary-files={without-match} "{search_pattern}" {path/to/directory}

• Use extended regular expressions (supports `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:

grep --extended-regexp --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:

grep --with-filename --line-number "{search_pattern}" {path/to/file}

• Search for lines matching a pattern, printing only the matched text:

grep --only-matching "{search_pattern}" {path/to/file}

• Search stdin for lines that do not match a pattern:

cat {path/to/file} | grep --invert-match "{search_pattern}"

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