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Full Discussion: How do i find "&variable[0]" using grep -r?
Top Forums Shell Programming and Scripting How do i find "&variable[0]" using grep -r? Post 302911978 by Scrutinizer on Tuesday 5th of August 2014 03:16:29 AM
Old 08-05-2014
How do i find "&variable[0]" using grep -r?
Hi Don, originally I wanted to expand my post with something similar (using -H if the user's grep supports it). With /dev/null option I worried that if the ARG_MAX would be reached with that xargs or + option, ARG_MAX might become exceeded when those arguments are fed to grep together with /dev/null. What are your thoughts on this?


I also did a small test with only one file and I found this, using OSX:
Code:
$ cat testdir/infile1
x
$ grep x ./testdir/infile1 
x
$ find . -name 'i*1' | xargs grep 'x'
./testdir/infile1:x
$ find . -name 'i*1' -exec grep 'x' {} +
./testdir/infile1:x
$ find . -name 'i*1' -exec grep 'x' {} \;
x

So it would seem that somehow the /dev/null precaution is only necessary when using \;

--EDIT--
Nevermind about that last bit, it seems this is not common behaviour , on other OS it does not print the file name, so this appears to be implementation specific.
Last edited by Scrutinizer; 08-05-2014 at 05:11 AM..
 

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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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