Script Description:

The following script moves files from ~/Desktop to ~/Files and directories from   ~/Desktop to    ~/Directories, renaming them in the format username_original-name.

user1@PC:~$ nl    script

1 if    test    -e    ~/Files/

2 then

3 mkdir    ~/Files/

4 fi

5 if [    !    -e    ~/Directories/   ]

6 then

7 mkdir    ~/Directories/

8 fi

9 usr="whoami"

10 cd    ~/Desktop/

11 WD=`pwd`

12 if [    "$WD"=      ~/Desktop    ]

13 then

14 for   obj    in    *

15 do

16 if [   "$obj"    -f    ]

17 then

18 mv    "$obj"      ~/Files/"$usr"_"$obj"

19 fi

20 else

21 then

22 if   test   -d    "$obj"

23 then

24 mv    "$obj"    ~/Directories/"$usr"_"$obj"

25 fi fi

26 od

27 fi

Question :

Identify the lines that contain any errors (logical or syntactical) from lines 21 to 27.