Detect disk volume label

unilabel.sh

#!/bin/sh
VOL=$1
if [ -z "$VOL" ] ; then
  echo Usage: $0 vol
  exit 1
fi
LABEL=""
command -v e2label      > /dev/null && [ -z "$LABEL" ] && LABEL=`e2label $VOL 2>/dev/null`
command -v dosfslabel   > /dev/null && [ -z "$LABEL" ] && LABEL=`dosfslabel $VOL 2>/dev/null`
command -v ntfslabel    > /dev/null && [ -z "$LABEL" ] && LABEL=`ntfslabel -f $VOL 2>/dev/null`
command -v volname      > /dev/null && [ -z "$LABEL" ] && LABEL=`volname $VOL 2>/dev/null`
command -v jfs_tune     > /dev/null && [ -z "$LABEL" ] && LABEL=`jfs_tune -l $VOL 2>/dev/null`
command -v reiserfstune > /dev/null && [ -z "$LABEL" ] && LABEL=`reiserfstune -l $VOL 2>/dev/null`
command -v xfs_admin    > /dev/null && [ -z "$LABEL" ] && LABEL=`xfs_admin -l $VOL 2>/dev/null`
echo $LABEL
exit 0