Linux in a Nutshell, Fifth Edition

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gawk

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

do

do

statement

while (expr)

Looping statement. Execute statement, then evaluate expr and if

true, execute statement again. A series of statements must be put

within braces.

exit

exit [expr]

Exit from script, reading no new input. The END procedure, if it

exists, will be executed. An optional expr becomes awk’s return

value.

exp

exp(x)

Return exponential of x (ex).

extension

extension(lib, init) {G}

Dynamically load the shared object file lib, calling the function init

to initialize it. Return the value returned by the init function. This

function allows you to add new built-in functions to gawk. See

Effective awk Programming (O’Reilly) for the details.

fflush

fflush([output-expr]) {E}

Flush any buffers associated with open output file or pipe output-

expr.

gawk extends this function. If no output-expr is supplied, it flushes

standard output. If output-expr is the null string (""), it flushes all

open files and pipes.

for

for (init-expr; test-expr; incr-expr)

statement

C-style looping construct. init-expr assigns the initial value of a

counter variable. test-expr is a relational expression that is evalu-

ated each time before executing the statement. When test-expr is

false, the loop is exited. incr-expr is used to increment the counter

variable after each pass. All of the expressions are ...