![]() 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-word constituent character. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. 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. This can be used to specify multiple search patterns, or to protect a pattern beginning with a hyphen (-). 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 matched. Interpret PATTERN as an extended regular expression (-E is specified by POSIX.) Print a usage message briefly summarizing these command-line options and the bug-reporting address, then exit
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