how to find the pattern within files?

Using grep we achieve this..

Say we have to find out the word "gdk" from all the '.c' files in a directory.. the command would be

$grep -i "pattern" files

ex: $grep -i "gtk" *.c          <===== Will search all .c files in the current directory.

ex: $grep -i "gtk" file1, file.23, file <== Will search only in the specified files.

Using "ls" and "find" command how to display only directories..?

Following commands list only directories in the current directory.

1. #ls -l | grep ^d

2. #ls -d */

3. #find -type d
Ex: #find /tmp -type d <-- This command shows all the directories with in the /tmp directory.

Want only files to be listed.. use 1. #ls -l | grep -v ^d

2. #find -type f
Ex: #find /tmp -type f <-- This command shows all regular files with in the /tmp directory.