#!/bin/bash
# Prints UUID of all or a specific partition

if [ "x$1" = "x" ];
then # No options given, print all
    echo -e "PARTITION \t DIR \t UUID"
    ls -lh /dev/disk/by-uuid/ | tail -n +2 | while read LINE
    do
        PARTITION=/dev/$(echo "$LINE" | awk '{ print $11 }' | sed 's_^\.\./\.\./__g')
        MPOINT=$(mount | grep $PARTITION | awk '{ print $3 }')
        UUID=/dev/disk/by-uuid/$(echo "$LINE" | awk '{ print $9 }')
        echo -e "$PARTITION \t $MPOINT \t $UUID"
    done | sort -n
else # Print specific partition
        if [ "$(ls -lh /dev/disk/by-uuid/ | grep -o $(basename $1))" != "$(basename $1)" ]
    then
        if [ "x$(echo $(basename $1) | egrep '^[a-z][a-z][a-z]$')" != "x" ]
        then # $1 is a harddrive
            echo "Error: /dev/$(basename $1) is a harddrive, not a partition."
            exit 1
        else
            echo "Error: /dev/$(basename $1) does not exist."
                fi
    else
        LINE=$(ls -lh /dev/disk/by-uuid/ | grep $(basename $1))
        PARTITION=/dev/$(echo "$LINE" | awk '{ print $11 }' | sed 's_^\.\./\.\./__g')
        MPOINT=$(mount | grep $PARTITION | awk '{ print $3 }')
        UUID=/dev/disk/by-uuid/$(echo "$LINE" | awk '{ print $9 }')
        echo -e "PARTITION \t DIR \t UUID"
        echo -e "$PARTITION \t $MPOINT \t $UUID"
    fi
fi