How to automatically detect and write to usb with variable spaces in its name

I am doing the second BASH exercise from TLDP Bash-Scripting Guide , and I have most of it figured out up until the part when it comes time to copy the compressed files to an inserted USB. > Home Directory Listing > > Perform a recursive directory listing on the user's home directory and save the information to a file. Compress the file, have the script > prompt the user to insert a USB flash drive, then press ENTER. > Finally, save the file to the flash drive after making certain the > flash drive has properly mounted by parsing the output of df. Note > that the flash drive must be unmounted before it is removed. As I progress with the script it is becoming less ..elegant, and was wondering if there was a better way to do this. I know creating files is likely not the most efficient way to do the comparisons, but have not got the shell expansions figured yet, and intend to change those once I get it working. The problem specifically is, to ensure that the usb is mounted and that I am writing to the USB and nowhere else. I am comparing the last line of df after the USB is plugged in with the last line of df from the diff between df before USB is plugged in and df after USB is plugged in, and looping until they match. Unfortunately, the diff result starts with a >, but I intend to use sed to get rid of that. The real problem is the path to where my usb is mounted is: > /media/flerb/"Title of USB with spaces" To make this portable for USBs that may have different names is my best bet from here to do something with awk and field separators? And as a follow-up, I know this is pretty inelegant, and wonder if there is a cleaner way to go about this...especially because this is the second exercise and still in EASY. The output from the df tails is: /dev/sdb1 15611904 8120352 7491552 53% /media/flerb/CENTOS 7 X8 > /dev/sdb1 15611904 8120352 7491552 53% /media/flerb/CENTOS 7 X8 The script so far 1 #!/bin/bash 2 3 if [ "$UID" -eq 0 ] ; then 4 echo "Don't run this as root" 5 exit 1 6 fi 7 8 #Create a backup file with the date as title in a backup directory 9 BACKUP_DIR="$HOME/backup" 10 DATE_OF_COPY=$(date --rfc-3339=date) 11 BACKUP_FILE="$BACKUP_DIR/$DATE_OF_COPY" 12 13 [ -d "$BACKUP_DIR" ] || mkdir -m 700 "$BACKUP_DIR" 14 15 #find all files recursively in $HOME directory 16 find -P $HOME >> "$BACKUP_FILE" 17 18 #use lzma to compress 19 xz -zk --format=auto --check=sha256 --threads=0 "$BACKUP_FILE" 20 21 #making files to use in operations 22 BEFORE="$BACKUP_DIR"/before_usb.txt 23 AFTER="$BACKUP_DIR"/after_usb.txt 24 DIFFERENCE="$BACKUP_DIR"/difference.txt 25 26 df > "$BEFORE" 27 read -p 'Enter USB and press any button' ok 28 sleep 2 29 df > "$AFTER" 30 diff "$BEFORE" "$AFTER" > "$DIFFERENCE" 31 sleep 2 32 echo 33 34 TAIL_AFTER=$(tail -n 1 "$AFTER") 35 TAIL_DIFF=$(tail -n 1 "$DIFFERENCE") 36 37 until [ "$TAIL_AFTER" == "$TAIL_DIFF" ] ; 38 do 39 echo "Not yet" 40 df > "$AFTER" 41 TAIL_AFTER=$(tail -n 1 "$AFTER") 42 diff "$BEFORE" "$AFTER" > "$DIFFERENCE" 43 TAIL_DIFF=$(tail -n 1 "$DIFFERENCE") 44 echo "$TAIL_AFTER" 45 echo "$TAIL_DIFF" 46 sleep 1 47 48 done 49 exit $?