how to differentiate file and directory name using ls command.
l
have you tried using ls -l command??
ls -l | grep ^d # for directories
if you use ls -l, the contents in the directory listed as below.
drwxr-xr-x 3 truesrc staff 9728 Nov 15 18:37 exercises/
-rw-r--r-- 1 truesrc staff 155 Oct 8 12:52 fibbno.cc
if entry is a directory, it starts with bit 'd'
if entry is a file,it starts with '-'