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Shell Programming and Scripting
how to compare file line by line with awk
Post 302673455 by kiranps on Wednesday 18th of July 2012 02:11:47 AM
07-18-2012
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Hi there
How can I compare data line by line from a file?
I need to compare the second value with the fourth to know if they are different.
If those values are different, I require to send my first value to the output until the complete file has been read.
This is my file:
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LEARN ABOUT PLAN9
yesterday
YESTERDAY(1) General Commands Manual YESTERDAY(1) NAME
yesterday - print file names from the dump SYNOPSIS
yesterday [ -c ] [ -date ] files ... DESCRIPTION
Yesterday prints the names of the files from the most recent dump. Since dumps are done early in the morning, yesterday's files are really in today's dump. For example, if today is March 17, 1992, yesterday /adm/users prints /n/dump/1992/0317/adm/users In fact, the implementation is to select the most recent dump in the current year, so the dump selected may not be from today. With option -c, yesterday copies the dump file to the current directory. The date option selects other day's dumps, with a format of 2, 4, 6, or 8 digits of the form dd, mmdd, yymmdd, or yyyymmdd. Yesterday does not guarantee that the string it prints represents an existing file. EXAMPLES
Back up to yesterday's MIPS binary of vc: cd /mips/bin yesterday -c vc Temporarily back up to March 1's MIPS C library to see if a program runs correctly when loaded with it: bind `{yesterday -0301 /mips/lib/libc.a} /mips/lib/libc.a rm v.out mk v.out FILES
/n/dump SOURCE
/rc/bin/yesterday SEE ALSO
fs(4) BUGS
It's hard to use this command without singing. YESTERDAY(1)