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Full Discussion: grep output clarification
Top Forums UNIX for Advanced & Expert Users grep output clarification Post 302302160 by rajp_8007 on Monday 30th of March 2009 08:49:08 AM
Old 03-30-2009
Quote:
Originally Posted by mgessner
Sure...

Your use of \. didn't reach grep, because the shell saw the \ and escaped the . which means grep saw a.c and not a\.c

What you want to do is either

$ grep 'a.c' grepf

or

$ grep a\\.c grepf

It's pretty safe to say that since most shells do some kind of regular expression handling, when you use grep you should put the regexp in quotes.
Then wht is the meaning of "." and "\."
 

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LEARN ABOUT LINUX

xzgrep

XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME

       xzgrep - search compressed files for a regular expression

SYNOPSIS

       xzgrep [grep_options] [-e] pattern file...
       xzegrep ...
       xzfgrep ...
       lzgrep ...
       lzegrep ...
       lzfgrep ...

DESCRIPTION

       xzgrep  invokes	grep(1)  on  files  which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options
       specified are passed directly to grep(1).

       If no file is specified, then standard input is decompressed if necessary and fed to grep(1).  When reading from  standard  input,  gzip(1)
       and bzip2(1) compressed files are not supported.

       If  xzgrep  is  invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1).  The same applies to names lzgrep, lze-
       grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.

ENVIRONMENT

       GREP   If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).

SEE ALSO

       grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)

Tukaani 							    2010-09-27								 XZGREP(1)
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