egrep

Find patterns in files using extended regular expression (supports `?`, `+`, `{}`, `()` and `|`).

• Search for a pattern within a file:

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

• Search for a pattern within multiple files:

egrep "{search_pattern}" {path/to/file1} {path/to/file2} {path/to/file3}

• Search stdin for a pattern:

cat {path/to/file} | egrep {search_pattern}

• Print file name and line number for each match:

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

• Search for a pattern in all files recursively in a directory, ignoring binary files:

egrep --recursive --binary-files={without-match} "{search_pattern}" {path/to/directory}

• Search for lines that do not match a pattern:

egrep --invert-match "{search_pattern}" {path/to/file}

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