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For a given file, named file, you can see by doing `ls -l file'; the number of links is shown in the second column, i.e. after the permission bits and before the file owner's username.
To find all regular files in a given set of directories topdirs (and their subdirectories) that have more than one link, do `find topdirs -type f -links +1'. (To find the files that only have a single link, change the `-links +1' to `-links 1'.)
Other useful options to `find' are `-xdev' (which stops
find from trying to descend other filesystems (especially
`/proc', which would usually result in a lot of error messages
being printed out)); and `-fstype ext2' (which is useful in the
context `find / -fstype ext2 ...', which is a simpler way of
writing `find `sed -n 's/^[^ ]* \([^ ]*\) ext2 .*/\1/p'
/proc/mounts` -xdev ...', both of which go through all ext2
filesystems currently mounted).
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