grep (pattern, x, ignore. It returns a vector of the matched elements or their indices. Grep -E "`, `()` 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 with color output: grep -with-filename -line-number -color = always "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" $ Follow cheat. grep () function searchs for matches of a string or string vector. This option is useful for passing to shell scripts that already use -i, to cancel its effects because the two options override each other. A -i option like grep uses would definitely be preferred, but for the case I was searching this topic for. ![]() ![]() ![]() Cheat.sh/grep $ curl cheat.sh/ cheat:grep # To search a file for a pattern: grep # To perform a case-insensitive search (with line numbers): grep -in # To recursively grep for string in : grep -R # Read search patterns from a file (one per line): grep -f # Find lines NOT containing pattern: grep -v # Set how many lines to show before (-B) and after (-A) pattern: grep -B 3 -A 2 # To grep with regular expressions: grep "^00" # Match lines starting with 00 New versions of grep have the option -no-ignore-case which overrides -i: -no-ignore-case Do not ignore case distinctions in patterns and input data.
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