I use the extension .tmp do show temporary files. However, these files could be in any one of several folders. Create a script to find and delete these.
This is a question i have for college and cannot do it. Does anyone know how to do it. Thanks!

Look at the 'find' command. It will search directories for files that meet a variety of criteria.
for your particular instance use:

And...check out the "-exec" option of the find command to add the command to remove the files.

Create list of files with extension '*.tmp' to a file:

Code:

find / -type f -name '*.tmp' -print 2>>/dev/null > /tmp/tmp_files_list.txt

Review and validate you are sure you want to delete files and if necessary edit file to remove any file names you do not want to delete:

Code:

less /tmp/tmp_files_list.txt

Remove files:

Code:

for file in $(</tmp/tmp_files_list.txt)
  do
    rm $file
  done

hth