MPE/iX Shell and Utilities Reference Manual, Vol 1

awk(1) MPE/iX Shell and Utilities awk(1)

# do-while loop

statement

while (condition)

# for loop

for (expression1; condition; expression2)

statement

The for statement is equivalent to:

expression1

while (condition){

statement

expression2

}

The for statement can also have the form

for (i in array)

statement

awk performs the statement once for each element in array; on each repetition, the variable i

contains the name of a subscript of array, running through all the subscripts in an arbitrary

order. If array is multi-dimensional (has multiple subscripts), i is expressed as a single string

with the SUBSEP character separating the subscripts.

The statement

break

exits a for or a while loop immediately.

continue

stops the current iteration of a for or while loop and begins the next iteration (if there is

one).

terminates any processing for the current input record and immediately starts processing the

next input record. Processing for the next record begins with the ﬁrst appropriate rule.

exit[(expr)]

immediately goes to the END action if it exists; if there is no END action, or if awk is already

performing the END action, the awk program terminates. awk sets the exit status of the pro-

gram to the numeric value of expr. If you omit (expr), the exit status is 0.

1-30 Commands and Utilities