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compare two files using awk

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Top Forums Shell Programming and Scripting compare two files using awk
# 8  
Old 11-03-2009
Code:
nawk 'NR==FNR {
_[$2]=$3
}
NR!=FNR{
  if(_[$2]!="")
   print _[$2]" "$0
  else
   print "000 "$0
}' b a
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LEARN ABOUT DEBIAN

hardlink

hardlink(1)						      General Commands Manual						       hardlink(1)

NAME

       hardlink - Link multiple copies of a file

SYNOPSIS

       hardlink [option]...  [directory|file]...

DESCRIPTION

       hardlink is a tool which replaces copies of a file with hardlinks, therefore saving space.

OPTIONS

       -h or --help
	      print quick usage details to the screen.

       -v or --verbose
	      More verbose output. If specified once, every hardlinked file is displayed, if specified twice, it also shows every comparison.

       -n or --dry-run
	      Do not act, just print what would happen

       -f or --respect-name
	      Only try to link files with the same (basename).

       -p or --ignore-mode
	      Link/compare files even if their mode is different. This may be a bit unpredictable.

       -o or --ignore-owner
	      Link/compare files even if their owner (user and group) is different. It is not predictable

       -t or --ignore-time
	      Link/compare files even if their time of modification is different. This will retain the newest timestamp, unless -m or -M is given.

       -m or --maximize
	      Try to maximize the link count of the files.

       -M or --minimize
	      Try to minimize the link count of the files.

       -x or --exclude
	      A regular expression which excludes files from being compared and linked.

       -i or --include
	      A  regular  expression to include files. If the option --exclude has been given, this option re-includes files which would otherwise
	      be excluded. If the option is used without --exclude, only files matched by the pattern are included.

ARGUMENTS

       hardlink takes one or more directories which will be searched for files to be linked.

BUGS

       hardlink assumes that the trees it operates on do not change during operation. If a tree does change, the result is  undefined  and  poten-
       tially  dangerous.  For example, if a regular file is replaced by a device, hardlink may start reading from the device. If a component of a
       path is replaced by a symbolic link or file permissions change, security may be compromised. Do not run hardlink on a changing tree or on a
       tree controlled by another user.

AUTHOR

       The  program  hardlink  and  this manpage have been written by Julian Andres Klode, and are licensed under the MIT license. See the code of
       hardlink for further information.

0.2.0								    2012-02-28							       hardlink(1)