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How to list hardlinks?

 
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Old 03-27-2008
How to list hardlinks?
Q1: Let's say I create a hard-link bar.c in /tmp to a file foo.c which resides in /var/tmp. Is there a easy way to find out which file /tmp/bar.c hardlinks to (and vice-versa - i.e which files have got hard-linked from /var/tmp/foo.c) when one does not (and wants to) know the location of the other file?

[ We can use inodes; but that won't help as I m talking about a scenario where I either don't know the file or the hard-link location and/or name. ]

Q2: It's little more simpler with symlinks since if given the symlink you can use the arrow to find out the name and path of the original file. Even here, how would one be able to find the name of the symlink given the name of the actual file?

PS: Even if there a not-so-easy solution to the question, I would like to know it. :-)

Mahesh
 
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LEARN ABOUT CENTOS

xfs_estimate

xfs_estimate(8) 					      System Manager's Manual						   xfs_estimate(8)

NAME

       xfs_estimate - estimate the space that an XFS filesystem will take

SYNOPSIS

       xfs_estimate [ -h ] [ -b blocksize ] [ -i logsize ]
		    [ -e logsize ] [ -v ] directory ...
       xfs_estimate -V

DESCRIPTION

       For  each directory argument, xfs_estimate estimates the space that directory would take if it were copied to an XFS filesystem.  xfs_esti-
       mate does not cross mount points.  The following definitions are used:
	      KB = *1024
	      MB = *1024*1024
	      GB = *1024*1024*1024

       The xfs_estimate options are:

       -b blocksize
	      Use blocksize instead of the default blocksize of 4096 bytes.  The modifier k can be used after the number to  indicate  multiplica-
	      tion by 1024.  For example,

		   xfs_estimate -b 64k /

	      requests an estimate of the space required by the directory / on an XFS filesystem using a blocksize of 64K (65536) bytes.

       -v     Display more information, formatted.

       -h     Display usage message.

       -i, -e logsize
	      Use  logsize instead of the default log size of 1000 blocks.  -i refers to an internal log, while -e refers to an external log.  The
	      modifiers k or m can be used after the number to indicate multiplication by 1024 or 1048576, respectively.

	      For example,

		   xfs_estimate -i 1m /

	      requests an estimate of the space required by the directory / on an XFS filesystem using an internal log of 1 megabyte.

       -V     Print the version number and exits.

EXAMPLES

       % xfs_estimate -e 10m /var/tmp
       /var/tmp will take about 4.2 megabytes
	       with the external log using 2560 blocks or about 10.0 megabytes

       % xfs_estimate -v -e 10m /var/tmp
       directory		     bsize   blocks    megabytes    logsize
       /var/tmp 		      4096	792	   4.0MB   10485760

       % xfs_estimate -v /var/tmp
       directory		     bsize   blocks    megabytes    logsize
       /var/tmp 		      4096     3352	  14.0MB   10485760

       % xfs_estimate /var/tmp
       /var/tmp will take about 14.0 megabytes

																   xfs_estimate(8)