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Top Forums UNIX for Dummies Questions & Answers problem with grep in combination with xargs Post 302269972 by Bruno on Friday 19th of December 2008 08:17:56 AM
Old 12-19-2008
problem with grep in combination with xargs

Dear all,
I have tried the following 2 lines

xargs -t -i -exec grep -i -w {} file_1 >>test < file_2

cat -s file_2| xargs -t -i -exec grep -i -w {} file_1 >> test

They were meant to search for the contents of file_2 in file_1 and write the respective lines of file_1 into file "test" . But instead it writes a standard error output
grep -i -w "string1" File_1
grep -i -w "string2" File_1
grep -i -w "string3" File_1
and creates an empty file "test"
Any ideas why this doesn't work?
I f I copy each of the above lines from the standard error output
they work and produce the expected result
Your help is very much appreciated

Thanks
Bruno
 

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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)
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