Using /dev/null with grep and find


 
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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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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other 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 the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)