The colors are defined by the environment variable Surround the matched (non-empty) strings, matching lines, context lines, file names, line numbers,īyte offsets, and separators (for fields and groups of context lines) with escape sequences toĭisplay them in color on the terminal. invert-match option (see below), count non-matching lines. Suppress normal output instead print a count of matching lines for each input file. Select only those matches that exactly match the whole line. Word-constituent characters are letters, digits, and the underscore. Similarly, it must be either at the end of the line or followed by a non-wordĬonstituent character. Substring must either be at the beginning of the line, or preceded by a non-word constituentĬharacter. Select only those lines containing matches that form whole words. Invert the sense of matching, to select non-matching lines. Ignore case distinctions in both the PATTERN and the input files. The empty file contains zero patterns, and therefore This can be used to specify multiple search patterns, or to protect a Matching Control -e PATTERN, -regexp= PATTERN Grep -P may warn of unimplemented features. Interpret PATTERN as a Perl regular expression (PCRE, see below). Interpret PATTERN as a basic regular expression (BRE, see below).
Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be Interpret PATTERN as an extended regular expression (ERE, see below). Print the version number of grep to the standard output stream. Generic Program Information -help Print a usage message briefly summarizing these command-line options and the bug-reporting ( -) is given as file name) for lines containing a match to the given PATTERN. Grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus
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