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- NAME
- bm -- search a file for a string
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- SYNOPSIS
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- bm [option] ... [strings] [file]
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- DESCRIPTION
- Bm searches the input files (standard input default) for lines
- matching a string. Normally, each line found is copied to the
- standard output. It is blindingly fast. Bm strings are fixed
- sequences of characters: there are no wildcards, repetitions, or
- other features of regular expressions. Bm is also case sensitive.
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- The following options are recognized.
- -x (Exact) only lines matched in their entirety are printed
- -l The names of files with matching lines are listed (once)
- separated by newlines.
- -c Only a count of the number of matches is printed
- -e string
- The string is the next argument after the -e flag. This
- allows strings beginning with '-'.
- -h No filenames are printed, even if multiple files are
- searched.
- -n Each line is preceded by the number of characters from the
- beginning of the file to the match.
- -s Silent mode. Nothing is printed (except error messages). This
- is useful for checking the error status.
- -f path The string list is taken from the path. This may be
- either a file or a tty.
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- Unless the -h option is specified the file name is shown if there is
- more than one input file. Care should be taken when using the
- characters $ * [ ^ | ( ) and \ in the strings (listed on the
- command line) as they are also meaningful to the Shell. It is safest
- to enclose the entire expression argument in single quotes ' '.
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- Bm searches for lines that contain one of the (newline-separated)
- strings, using the Boyer-Moore algorithm. It is far superior in
- terms of speed to the grep (egrep, fgrep) family of pattern matchers
- for fixed-pattern searching, and its speed increases with pattern
- length.
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- SEE ALSO
- grep(1)
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- DIAGNOSTICS
- Exit status is 0 if any matches are found, 1 if none, 2 for syntax
- errors or inaccessible files.
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- AUTHOR
- Peter Bain (pdbain bnr-vpa), with modifications suggested by John
- Gilmore and Amir Plivatsky
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- BUGS
- Only 100 patterns are allowed.
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- Patterns may not contain newlines.
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- If a line (delimited by newlines, and the beginning and end of the
- file) is longer than 8000 charcters (e.g. in a core dump), it will
- not be completely printed.
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- If multiple patterns are specified, the order of the ouput lines is
- not necessarily the same as the order of the input lines.
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- A line will be printed once for each different string on that line.
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- The algorithm cannot count lines.
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- The -n and -c work differently from fgrep.
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- The -v, -i, and -b are not available.
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