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2.1.2 Matching Control
- ‘-e pattern’
- ‘--regexp=pattern’
-
Use pattern as the pattern. This can be used to specify multiple search patterns, or to protect a pattern beginning with a ‘-’. (‘-e’ is specified by POSIX.)
- ‘-f file’
- ‘--file=file’
-
Obtain patterns from file, one per line. The empty file contains zero patterns, and therefore matches nothing. (‘-f’ is specified by POSIX.)
- ‘-i’
- ‘-y’
- ‘--ignore-case’
-
Ignore case distinctions in both the pattern and the input files. ‘-y’ is an obsolete synonym that is provided for compatibility. (‘-i’ is specified by POSIX.)
- ‘-v’
- ‘--invert-match’
-
Invert the sense of matching, to select non-matching lines. (‘-v’ is specified by POSIX.)
- ‘-w’
- ‘--word-regexp’
-
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.
- ‘-x’
- ‘--line-regexp’
-
Select only those matches that exactly match the whole line. (‘-x’ is specified by POSIX.)
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