egrep 1 "28 Mar 1995" (original) (raw)
egrep 1 "28 Mar 1995"
NAME
egrep - search a file for a pattern using full regular expressions
SYNOPSIS
\f3/usr/bin/egrep\f1 [-bchilnsv] [-e _pattern_list_][-f _file_] [_strings_] [file... ]
\f3/usr/xpg4/bin/egrep\f1 [-bchilnsvx] [-e _pattern_list_] [-f _file_] [_strings_] [file... ]
AVAILABILITY
/usr/bin/egrep
SUNWcsu
/usr/xpg4/bin/egrep
SUNWxcu4
DESCRIPTION
\f3egrep (\f2expression grep\f1) searches files for a pattern of characters and prints all lines that contain that pattern. \f3egrep uses full regular expressions (expressions that have string values that use the full set of alphanumeric and special characters) to match the patterns. It uses a fast deterministic algorithm that sometimes needs exponential space.
If no files are specified, \f3egrep assumes standard input. Normally, each line found is copied to the standard output. The file name is printed before each line found if there is more than one input file.
/usr/bin/egrep
\f3/usr/bin/egrep\f1 accepts full regular expressions as described on theregexp(5) manual page, except for \f3\(\f1 and \f3\)\f1, and with the addition of:
A full regular expression followed by \f3+\f1 that matches one or more occurrences of the full regular expression.
A full regular expression followed by \f3?\f1 that matches 0 or 1 occurrences of the full regular expression.
Full regular expressions separated by \(bv or by athat match strings that are matched by any of the expressions.
A full regular expression that may be enclosed in parentheses \f3()\f1 for grouping.
Be careful using the characters \f3$\f1, \f3*\f1, \f3[\f1, \f3^\f1, \(bv, \f3(\f1, \f3)\f1, and \f3\f1 in \f2full regular expression\f1, because they are also meaningful to the shell. It is safest to enclose the entire_full_in single quotes \f3\(fm\f1...\f3\(fm\f1.
The order of precedence of operators is \f3[]\f1, then \f3\(**?+\f1, then concatenation, then \(bv and NEWLINE.
/usr/xpg4/bin/egrep
/usr/xpg4/bin/egrepuses the regular expressions described in the EXTENDEDsection of the regex(5) manual page.
OPTIONS
The following options are supported:
-b
Precede each line by the block number on which it was found. This can be useful in locating block numbers by context (first block is 0).
-c
Print only a count of the lines that contain the pattern.
-e pattern_list
Search for a_pattern_list_(_full regular expression_that begins with a \f3-\f1).
-f file
Take the list of_full_from file.
-h
Suppress printing of filenames when searching multiple files.
-i
Ignore upper/lower case distinction during comparisons.
-l
Print the names of files with matching lines once, separated by NEWLINEs. Does not repeat the names of files when the pattern is found more than once.
-n
Precede each line by its line number in the file (first line is 1).
-s
Work silently, that is, display nothing except error messages. This is useful for checking the error status.
-v
Print all lines except those that contain the pattern.
/usr/xpg4/bin/egrep
-x
Consider only input lines that use all characters in the line to match an entire fixed string or regular expression to be matching lines.
OPERANDS
The following operands are supported:
file
A path name of a file to be searched for the patterns. If no_file_operands are specified, the standard input will be used.
/usr/bin/egrep
pattern
Specify a pattern to be used during the search for input.
/usr/xpg4/bin/egrep
pattern
Specify one or more patterns to be used during the search for input. This operand is treated as if it were specified as-e pattern_list\f1.
ENVIRONMENT
Seeenviron(5) for descriptions of the following environment variables that affect the execution ofegrep:LC_COLLATE\f1,LC_CTYPE\f1,LC_MESSAGES\f1, andNLSPATH\f1.
EXIT STATUS
The following exit values are returned:
0
if any matches are found
1
if no matches are found
2
for syntax errors or inaccessible files (even if matches were found).
SEE ALSO
fgrep(1),grep(1),sed(1),sh(1),environ(5),regex(5),regexp(5)
NOTES
Ideally there should be only one \f3grep command, but there is not a single algorithm that spans a wide enough range of space-time tradeoffs. Lines are limited to characters; longer lines are truncated. is defined in \f3<stdio.h>.\f1
/usr/xpg4/bin/egrep
/usr/xpg4/bin/egrepis identical to**/usr/xpg4/bin/grep**(seegrep(1)). Portable applications should use**/usr/xpg4/bin/grep -E**.