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Top Forums Shell Programming and Scripting Comparing two files to get only records to be inserted and updated Post 302877583 by Don Cragun on Monday 2nd of December 2013 11:28:44 AM
Old 12-02-2013
Quote:
Originally Posted by zozoo
thanks Don Cragun for trying and poiting out the error. if you use
Code:
while

loop and
Code:
grep

combination then we can achieve the desired result.
Hi zozoo,
If we make some assumptions about the input that the original poster did not specify, then it might be possible to write a while read loop using grep to get the output specified in the 1st message in this thread, but I don't think it is as easy as you're implying.

Can you show us a while loop using grep that produces the output requested in the 1st message in this thread from the two input files shown in that message?
 

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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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