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Full Discussion: Find Hard Link
Top Forums Shell Programming and Scripting Find Hard Link Post 302431205 by methyl on Monday 21st of June 2010 06:45:05 AM
Old 06-21-2010
In summary. Two or more files within the same filesystem with the same inode number are "hard linked".

Scrutinizer has pointed to the link count for an ordinary file in "ls -l". Value 2 or more shows hard links.

"radolouv" has the right idea by using "find -xdev" because inode numbers are only unique within a filesystem. However to find all files hard linked to a given filename the find must be from the mountpoint.

One way of testing whether a file is a "hard link" and then listing all the files with the same inode. This script contains code to find out the mountpoint containing a file under HP-UX. Will need changing for other O/S which don't have this layout of "bdf".

Code:
#!/bin/ksh
FILENAME="${1}"
if [ "${FILENAME}""X" = "X" ]
then
        echo "Usage: ${PN} filename"
        exit
fi
if [ ! -f "${FILENAME}" ]
then
        echo "${PN}: File missing: ${FILENAME}"
        exit
fi
#
# Find mountpoint containing file (HP-UX method)
DIR=`dirname "${FILENAME}"`
MOUNTPOINT=`bdf "${DIR}" | grep -v "Filesystem" | awk '{print $6}'`
#
ls -liad "${FILENAME}" | awk '{print $1,$3}' | while read INUM LINKS
do
        if [ ${LINKS} -gt 1 ]
        then
                # File is a hard link
                find "${MOUNTPOINT}" -xdev -inum ${INUM} -print | \
                while read FILENAME2
                do
                        echo "Hard link"
                        ls -liad "${FILENAME2}" 
                done
        else
                echo "Not Hard Link"
                ls -liad "${FILENAME2}" 
        fi
done

This User Gave Thanks to methyl For This Post:
radoulov
 

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