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Full Discussion: Retreive the records from file2 by using the first field in file1
Top Forums Shell Programming and Scripting Retreive the records from file2 by using the first field in file1 Post 302717333 by RudiC on Thursday 18th of October 2012 03:34:51 AM
Old 10-18-2012
Better than running grep 1L times is to prepare a "pattern file" and use grep with it:
Code:
awk -F"\|" '{print $1}' file1 > pattfile; grep -f pattfile file2 >out.txt; rm pattfile

This User Gave Thanks to RudiC For This Post:
i150371485
 

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LEARN ABOUT BSD

zgrep

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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