How to determine whether a directory is on an NFS mounted drive?

Question

How can I determine whether a given directory on a Linux machine is from an NFS mounted drive or not?

Answer 1

You could use the stat utility with -f to say you're looking for information about the filesystem.

For example:

$ stat -f -c %T .
ext2/ext3
$ stat -f -c %T /sys
sysfs
$ stat -f -c %T /proc
proc
$ if [[ $(stat -f -c %T /proc) == proc ]] ; then echo Good ; fi
Good

(See the man page for the different formatting options, and sorry I don't have an NFS mount handy.)

Answer 2

You could use df -t nfs <directory>, which will produce output like

$ df /home/aland/ -t nfs
Filesystem           1K-blocks      Used Available Use% Mounted on
nfs_oscar:/home      1255425376 874128064 316496736  74% /home

if directory belogs to NFS mount, and nothing otherwise:

$ df /root/ -t nfs
Filesystem           1K-blocks      Used Available Use% Mounted on

Edit: simpler way: df -T <directory> (flag -P is used to disable pretty formatting to facilitate tailing and awking):

$ df /home/aland/ -TP  | tail -n -1 | awk '{print $2}'
nfs