agrep - print lines approximately matching a pattern
Searches for approximate matches of PATTERN in each FILE or standard input.
Example: `agrep -2 optimize foo.txt' outputs all lines in file `foo.txt' that
match "optimize" within two errors. E.g. lines which contain
"optimise", "optmise", and "opitmize" all match.
- -e PATTERN,
- Use PATTERN as a regular expression; useful to
protect patterns beginning with -.
- -i, --ignore-case
- Ignore case distinctions (as defined by the current locale)
in PATTERN and input files.
- -k, --literal
- Treat PATTERN as a literal string, that is, a fixed
string with no special characters.
- -w, --word-regexp
- Force PATTERN to match only whole words. A
"whole word" is a substring which either starts at the beginning
or the record or is preceded by a non-word constituent character.
Similarly, the substring must either end at the end of the record or be
followed by a non-word constituent character. Word-constituent characters
are alphanumerics (as defined by the current locale) and the underscore
character. Note that the non-word constituent characters must
surround the match; they cannot be counted as errors.
- -D NUM, --delete-cost=NUM
- Set cost of missing characters to NUM.
- -I NUM, --insert-cost=NUM
- Set cost of extra characters to NUM.
- -S NUM,
- Set cost of incorrect characters to NUM. Note that a
deletion (a missing character) and an insertion (an extra character)
together constitute a substituted character, but the cost will be the that
of a deletion and an insertion added together. Thus, if the const of a
substitution is set to be larger than the sum of the costs of deletion and
insertion, direct substitutions will never be done.
- -E NUM, --max-errors=NUM
- Select records that have at most NUM errors.
- Select records that have at most # errors (#
is a digit between 0 and 9).
- -d PATTERN,
- Set the record delimiter regular expression to
PATTERN. The text between two delimiters, before the first
delimiter, and after the last delimiter is considered to be a record. The
default record delimiter is the regexp "\n", so by default a
record is a line. PATTERN can be any regular expression that does
not match the empty string. For example, using -d "^From
" defines mail messages as records in a Mailbox format file.
- -v, --invert-match
- Select non-matching records instead of matching
- -V, --version
- Print version information and exit.
- -y, --nothing
- Does nothing. This options exists only for compatibility
with the non-free agrep program.
- Display a brief help message and exit.
- -B, --best-match
- Only output the best matching records, that is, the records
with the lowest cost. This is currently implemented by making two passes
over the input files and cannot be used when reading from standard
- --color, --colour
- Highlight the matching strings in the output with a color
marker. The color string is taken from the GREP_COLOR environment
variable. The default color is red.
- -c, --count
- Only print a count of matching records per each input file,
suppressing normal output.
- -h, --no-filename
- Suppress the prefixing filename on output when multiple
files are searched.
- -H, --with-filename
- Prefix each output record with the name of the input file
where the record was read from.
- -l, --files-with-matches
- Only print the name of each input file which contains at
least one match, suppressing normal output. The scanning for each file
will stop on the first match.
- -n, --record-number
- Prefix each output record with its sequence number in the
input file. The number of the first record is 1.
- -q, --quiet, --silent
- Do not write anything to standard output. Exit immediately
with zero exit status if a match is found.
- -s, --show-cost
- Print match cost with output.
- Prefix each output record with the start and end offset of
the first match within the record. The offset of the first character of
the record is 0. The end position is given as the offset of the first
character after the match.
- -M, --delimiter-after
- By default, the record delimiter is the newline character
and is output after the matching record. If -d is used, the record
delimiter will be output before the matching record. This option causes
the delimiter to be output after the matching record.
With no FILE
, or when FILE
is -, reads standard input. If less
than two FILE
s are given -h
is assumed, otherwise -H
Exit status is 0 if a match is found, 1 for no match, and 2 if there were
errors. If -E
or - #
is not specified, only exact matches are
is a POSIX extended regular expression (ERE) with the TRE
Report bugs to the TRE mailing list
Copyright © 2002-2004 Ville Laurikari.
This is free software, and comes with ABSOLUTELY NO WARRANTY. You are welcome to
redistribute this software under certain conditions; see the source for the
full license text.