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Man Pages


Manual Reference Pages  -  RGREP (1)

NAME

rgrep - a recursive, highlighting grep program

CONTENTS

Synopsis
Description
Command Line Options
Supported Regular Expressions:
Examples
Author

SYNOPSIS

rgrep [ options ] pattern [ file ] ...

DESCRIPTION

rgrep, unlike grep(1) and egrep(1) rgrep has the ability to recursively descend directories. The traditional way of performing this kind of search on Unix systems utilizes the find(1) command in conjunction with grep(1). However, this results in very poor performance.

COMMAND LINE OPTIONS

-?

additional help (use ’-?’ to avoid shell expansion on some systems)
-c
count matches
-h
highlight match (ANSI compatable terminal assumed)
-H
Output match instead of entire line containing match
-i
ignore case
-l
list filename only
-n
print line number of match
-F
follow links
-r
recursively scan through directory tree
-N
Do NOT perform a recursive search
-R ’pat’
like ’-r’ except that only those files matching ’pat’ are checked
-v
print only lines that do NOT match the specified pattern
-x ’ext’
checks only files with extension given by ’ext’.
-D
Print all directories that would be searched. This option is for debugging purposes only. No file is grepped with this option.
-W ’len’
lines are ’len’ characters long (not newline terminated).

SUPPORTED REGULAR EXPRESSIONS:

.

match any character except newline
\
match any digit
\\e
match ESC char
*
matches zero or more occurences of previous RE
+
matches one or more occurences of previous RE
?
matches zero or one occurence of previous RE
^
matches beginning of line
$
matches end of line
[ ... ]
matches any single character between brackets. For example, [-02468] matches ’-’ or any even digit. and [-0-9a-z] matches ’-’ and any digit between 0 and 9 as well as letters a through z.

\\{ ... \\}

\\( ... \\)

\\1, \\2, ..., \\9

matches match specified by nth ’\\( ... \\)’ expression. For example, ’\\([ \\t][a-zA-Z]+\\)\\1[ \\t]’ matches any word repeated consecutively.

EXAMPLES

Look in all files with a ’c’ extension in current directory and all its subdirectories looking for matches of ’int ’ at the beginning of a line, printing the line containing the match with its line number: (two methods)

rgrep -n -R ’*.c’ ’^int ’ .

rgrep -n -x c ’^int ’ .

Highlight all matches of repeated words in file ’paper.tex’:

rgrep -h ’[ \\t]\\([a-zA-Z]+\\)[ \\t]+\\1[ \\t\\n]’ paper.tex

rgrep -h ’^\\([a-zA-Z]+\\)[ \\t]+\\1[ \\t\\n]’ paper.tex

(Note that this version of rgrep requires two passes for this example)

Search through all files EXCEPT .o and .a file below /usr/src/linux looking for the string ’mouse’ without regard to case:

rgrep -i -R ’*.[^ao]’ mouse /usr/src/linux

Search a fixed record length FITS file for the keyword EXTNAME:

rgrep -W80 ^EXTNAME file.fits

(Note that the regular expression ’^[A-Z]+’ will dump all fits headers.)

AUTHOR

"""John E. Davis""" <davis@space.mit.edu>

-- This manpage was translated to troff by

"Boris D. Beletsky" <borik@isracom.co.il>

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Debian RGREP (1) OCT 1996

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