A few things to check oweng:

1. Make sure it's in /home/user. You can't execute anything from /home/user/MyDocs due to permissions issues.
2. Check the filename: did you save it as "cifsmount.txt" by any chance?
3. Make sure you're in the right directory. Before trying to chmod the file or execute the script, run "ls -l" and make sure you see cifsmount.