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Full Discussion: Replacing data of output file with input
Top Forums Shell Programming and Scripting Replacing data of output file with input Post 302281339 by rwuerth on Wednesday 28th of January 2009 04:52:42 PM
Old 01-28-2009
Quote:
Originally Posted by bhagya2340
I dont want to compare file and remove duplicates....i want to cheack if that pattern is already present in the file then remove it and replace it with the input....if not just place the input...
The partten here CUR_MAINT_DATE...
Seemed overkill to me to replace a line of data with an exact duplicate, when you can use a command that will get you only the newest data. 'comm' has options on the output.

Quote:
i want something with grep, sid and awk...
What if that made things more complicated than they need to be?

Granted I could be missing something that you either haven't mentioned, or I just don't undestand your explanation very well. But if I understand you correctly, the file that should have all the data added to it is 'time.out' and that data is coming from 'runtime.out'

If the structure of both files are the same as you posted in your first post, then the comm command will work for you.

Code:
comm -23 runtime.out time.out >> time.out

You don't even need to run it through tr to get rid of tabs, since only the data in runtime.out not appearing in time.out will be printed in the first column w/o any added tabs.
 

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LEARN ABOUT DEBIAN

comm

COMM(1) 							   User Commands							   COMM(1)

NAME

       comm - compare two sorted files line by line

SYNOPSIS

       comm [OPTION]... FILE1 FILE2

DESCRIPTION

       Compare sorted files FILE1 and FILE2 line by line.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and
       column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
	      check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
	      do not check that the input is correctly sorted

       --output-delimiter=STR
	      separate columns with STR

       --help display this help and exit

       --version
	      output version information and exit

       Note, comparisons honor the rules specified by `LC_COLLATE'.

EXAMPLES

       comm -12 file1 file2
	      Print only lines present in both file1 and file2.

       comm -3 file1 file2
	      Print lines in file1 not in file2, and vice versa.

AUTHOR

       Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

       Report comm bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report comm translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       join(1), uniq(1)

       The full documentation for comm is maintained as a Texinfo manual.  If the info and comm programs are properly installed at your site,  the
       command

	      info coreutils 'comm invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							   COMM(1)
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