Awk

Powerful scripting language available on all Unix systems designed to manipulated streams. Very similar in syntax to the C language.

e.g.

awk '{

printf("This line, %d, contains: %s,", NR, $0);

printf("First word is, %s\n", $1);

}' <<HERE-TAG

hello [1]

there [2]

1 [3]

HERE-TAG

--> This line, 1, contains: hello [1], First word is, hello

--> This line, 2, contains: there [2], First word is, there

--> This line, 3, contains: 1 [3], First word is, 1