Use printf

backup

@@ -20,7 +20,7 @@ declare -r description="latest incremental backup"
 set -e
 
 if [[ $EUID -ne 0 ]]; then
-    echo "Script must be run as root." 
+    printf "Script must be run as root.\n" 
     exit
 fi
 
@@ -43,13 +43,13 @@ for x in $UUIDS; do
     UUIDS_ARRAY[$i]=$x
     i=$((i+1))
 done
-echo "Selected a mounted BTRFS device to backup to."
+printf "Selected a mounted BTRFS device to backup to.\n"
 disk=-1
 while [[ $disk -lt 0 || $disk -gt $i ]]; do
     for x in "${!TARGETS_ARRAY[@]}"; do
-        echo -e "$((x+1))) ${UUIDS_ARRAY[$x]}\t(${TARGETS_ARRAY[$x]})"
+        printf "%s) %s (%s)\n" "$((x+1))" "${UUIDS_ARRAY[$x]}" "${TARGETS_ARRAY[$x]}"
     done
-    echo "0) Exit"
+    printf "0) Exit\n"
     read -r -p "Enter a number: " disk
 done
 if [[ $disk == 0 ]]; then
@@ -57,12 +57,12 @@ if [[ $disk == 0 ]]; then
 fi
 selected_uuid="${UUIDS_ARRAY[$((disk-1))]}"
 selected_mnt="${TARGETS_ARRAY[$((disk-1))]}"
-echo "You selected the disk with UUID $selected_uuid."
+printf "You selected the disk with UUID %s.\n" "$selected_uuid"
 
 if [[ -f /etc/conf.d/snapper ]]; then
     source /etc/conf.d/snapper 
 else
-    echo "ERROR: /etc/conf.d/snapper does not exist!"
+    printf "ERROR: /etc/conf.d/snapper does not exist!\n"
     exit 1
 fi
 
@@ -70,22 +70,22 @@ for x in $SNAPPER_CONFIGS; do
 
     source /etc/snapper/configs/$x
 
-    echo "At '$x' configuration"
+    printf "At '%s' configuration\n" "$x"
 
     old_number=$(snapper -c "$x" list -t single | awk '/'"$selected_uuid"'/ {print $1}')
     old_snapshot=$SUBVOLUME/.snapshots/$old_number/snapshot
 
     if [[ -z "$old_number" ]]; then
-        echo "No backups have been performed for '$x' on this disk."
+        printf "No backups have been performed for '%s' on this disk.\n" "$x"
         read -r -p "Enter name of directory to store backups: " mybackupdir
-        echo "This will be the initial backup for snapper configuration '$x' to this disk. This could take awhile."
+        printf "This will be the initial backup for snapper configuration '%s' to this disk. This could take awhile.\n" "$x"
         BACKUPDIR="$selected_mnt/$mybackupdir"
         mkdir -p "$BACKUPDIR"
     else
-        mybackupdir=$(snapper -c root list -t single | awk -F"|" '/'$selected_uuid'/ {print $5}' | awk -F "," '{print $1}' | awk -F"=" '{print $2}')
+        mybackupdir=$(snapper -c root list -t single | awk -F"|" '/'"$selected_uuid"'/ {print $5}' | awk -F "," '{print $1}' | awk -F"=" '{print $2}')
         BACKUPDIR="$selected_mnt/$mybackupdir"
         if [[ ! -d $BACKUPDIR ]]; then
-            echo "ERROR: $BACKUPDIR is not a directory on $selected_uuid."
+            printf "ERROR: %s is not a directory on %s.\n" "$BACKUPDIR" "$selected_uuid"
             exit 1
         fi
     fi
@@ -95,10 +95,10 @@ for x in $SNAPPER_CONFIGS; do
     new_info=$SUBVOLUME/.snapshots/$new_number/info.xml
     sync
     backup_location=$BACKUPDIR/$x/$new_number/
-    echo "Backup location: $backup_location"
+    printf "Backup location: %s\n" "$backup_location"
 
     read -r -n 1 -p "Continue (y/n)? " cont_backup
-    echo
+    printf "\n"
     if [[ "$cont_backup" != "y" ]]; then
         continue
     fi
@@ -130,4 +130,4 @@ done
 
 date > "$HOME"/.lastbackup
 
-echo "Done!"
+printf "Done!\n"