I need to search for files that has no user OR no group.
find / -nouser -o -nogroup I think this is OK. But, I don't want to search NFS shares. How can I exclude the NFS shares in the find command?
4 Answers
The closest you will probably get is to use -xdev , which means "Don't descend directories on other filesystems." Then you'll need to specify which filesystems you do want to search.
With GNU find, you can use the -fstype predicate:
find / -fstype nfs -prune -o \( -nouser -o -nogroup \) -print Having said that, hymie's approach probably makes more sense: white-list what FS you want to search rather than black-listing those that you don't want to search.
If you want to only include jfs2 file systems (assuming / is on jfs2), then, you need to write it:
find / ! -fstype jfs2 -prune -o \( -nouser -o -nogroup \) -print Don't write it:
find / -fstype jfs2 \( -nouser -o -nogroup \) -print As while that would stop find from printing files in non-jfs2 filesystem, that would not stop it from crawling those non-jfs2 filesystems (which you need -prune for).
Note that -a (AND which is implicit if omitted) has precedence over -o (OR), so you need to watch whether parenthesis are needed or not.
The above correct command is short for:
find / \( \( ! -fstype jfs2 \) -a -prune \) -o \ \( \( -nouser -o -nogroup \) -a -print \) answered Feb 6, 2013 at 16:19
Stéphane Chazelas
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I tried specific find options for this and encountered problems, so switched to this method:
find $(mount | awk '!/:/ {printf "%s ", $3}') -xdev This should search all file systems which are not NFS mounted.
find / -fstype ext4 -nouser -o -nogroupSubstitute ext3, etc. if you're not using ext4findfrom descending into nfs FS, just not to print the files it would find there.ducombining-fstypeand-xdev(aka-mount) seems necessary