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Full Discussion: Using /dev/null with grep and find
Top Forums UNIX for Dummies Questions & Answers Using /dev/null with grep and find Post 302218891 by gaurav_s on Sunday 27th of July 2008 11:38:22 AM
Old 07-27-2008
Using /dev/null with grep and find
Hi,
I am trying to display the filename in which a string was found after using find and grep. For this after some googling I found that this works:

find -name "*.java" -exec grep "searchStr" {} /dev/null \;

I wanted to know the difference between the above and the following:

find -name "*.java" -exec grep "searchStr" {} \;

When I use the first command with /dev/null I get the filename as well in which the string was found which is not the case in second. Since /dev/null is a null device how does the flow work such that appending it starts displaying the file name.

TIA
Gaurav
 

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LEARN ABOUT OPENDARWIN

bzgrep

BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME

       bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression

SYNOPSIS

       bzgrep [ grep_options ] [ -e ] pattern filename...
       bzegrep [ egrep_options ] [ -e ] pattern filename...
       bzfgrep [ fgrep_options ] [ -e ] pattern filename...

DESCRIPTION

       Bzgrep  is  used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep.  If no file is specified,
       then the standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and  fed	to
       grep.

       If  bzgrep  is  invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, bzgrep
       uses it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	bzgrep string files
	   for csh: (setenv GREP fgrep; bzgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

SEE ALSO

       grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1)

																	 BZGREP(1)
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