Display line numbers using the cat command

A simple feature you one day may be glad you know.

By adding the -n option you can make the cat command display line numbers in the output. Here is an example.

$ cat -n helloworld.c
    1  #include <stdio.h>
    2
    3  int main(void)
    4  {
    5    printf("Hello, World\n");
    6
    7    return 0;
    8  }