CentOS 7.0 - man page for hardlink (centos section 1)

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hardlink(1)									      hardlink(1)

       hardlink - Consolidate duplicate files via hardlinks

       hardlink [-c] [-n] [-v] [-vv] [-h] directory1 [ directory2 ... ]

       This  manual  page documents hardlink, a program which consolidates duplicate files in one
       or more directories using hardlinks.

       hardlink traverses one or more directories searching for duplicate files.  When	it  finds
       duplicate  files, it uses one of them as the master.  It then removes all other duplicates
       and places a hardlink for each one pointing to the master file.	This allows for conserva-
       tion  of  disk space where multiple directories on a single filesystem contain many dupli-
       cate files.

       Since hard links can only span a single filesystem,  hardlink  is  only	useful	when  all
       directories specified are on the same filesystem.

       -c	 Compare only the contents of the files being considered for consolidation.  Dis-
		 regards permission, ownership and other differences.

       -f	 Force hardlinking across file systems.

       -n	 Do not perform the consolidation; only print what would be changed.

       -v	 Print summary after hardlinking.

       -vv	 Print every hardlinked file and bytes saved. Also print summary after	hardlink-

       -h	 Show help.

       hardlink was written by Jakub Jelinek <jakub@redhat.com>.

       Man page written by Brian Long.

       Man page updated by Jindrich Novy <jnovy@redhat.com>

       hardlink assumes that its target directory trees do not change from under it.  If a direc-
       tory tree does change, this may result in hardlink accessing files and/or directories out-
       side of the intended directory tree.  Thus, you must avoid running hardlink on potentially
       changing directory trees, and especially on directory trees under control of another user.

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