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Full Discussion: awk compare specific columns from 2 files, print new file
Top Forums Shell Programming and Scripting awk compare specific columns from 2 files, print new file Post 302573395 by otheus on Monday 14th of November 2011 09:47:52 AM
Old 11-14-2011
Pretty standard problem:
Code:
awk 'FNR==NR { r[$1] = $0; next; } r[$1] { print r[$1]; next } { print }' FILE1 FILE2 >FILE3

where FILE2 contains the ORIGINAL lines, and FILE1 contains the ones you want to replace, keyed on column 1.
Last edited by otheus; 11-14-2011 at 10:48 AM.. Reason: correction
 

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pdiff

PDIFF(1)								FSF								  PDIFF(1)

NAME

       pdiff - produce a pretty comparison between files

SYNOPSIS

       pdiff FILE1 FILE2 [-- A2PS-OPTIONS...]

DESCRIPTION

       Pretty print the differences between FILE1 and FILE2.

OPTIONS

       -h, --help
	      display this help and exit

       -v, --version
	      display version information and exit

       -q, --quiet
	      don't print informational messages

       -o, --output=FILE
	      save the output in FILE

       Options for a2ps are given after `--', for instance

	      $ pdiff COPYING COPYING.LIB -- -Pdisplay

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AUTHOR

       Written by Akim Demaille.

REPORTING BUGS

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COPYRIGHT

       Copyright (C) 1997-1999 Akim Demaille, Miguel Santana
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       a2ps(1), card(1), fixps(1), pdiff(1), psset(1), texi2dvi4a2ps(1).

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

	      info pdiff

       should give you access to the complete manual.

pdiff 0.4 (GNU a2ps 4.14)					     June 2014								  PDIFF(1)
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