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.