7.2. Using sed Utility

The sed utility is a stream editor that can be used for different file editing purposes when used as a filter. The most common task for software development purposes is the use of sed to search and replace text in source code files. Let us take the example of the following C source code file hello.c.

#include <stdio.h>

main ()
{
  char string[25];

  printf ("Enter a line of characters : ");
  scanf ("%s", string);
  printf ("The entered string is : %s\n ", string);
}