#!/usr/bin/bash
# Get the NFS version number (i.e. 3, 4, 4.1, etc) of specified mountpoint

[ "$#" -eq "0" ] && {
	echo "usage: $0  <nfs mount point>"
	exit 1
}
mp=${1%/}
mountpoint -q $mp || {
	echo "$mp is not a mount point"
	exit 1
}
mount -t nfs,nfs4 | grep -w $mp >/dev/null 2>&1 || {
	echo "$mp is not a nfs mount point"
	exit 1
}
nfsstat -m | grep -A 1 -w $mp | grep 'vers=' | sed -r 's/.*,vers=([.0-9]+).*/\1/'
