HP-UX Reference (11i v1 05/09) - 1 User Commands A-M (vol 1)

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awk(1) awk(1)

The arguments in ARGV can be modiﬁed or added to;

ARGC can be altered. As

each input ﬁle ends,

awk will treat the next non-null element of

ARGV, up to the

current value of

ARGC-1, inclusive, as the name of the next input ﬁle. Thus, setting

an element of ARGV to null means that it will not be treated as an input ﬁle. The

name - indicates the standard input. If an argument matches the format of an

assignment operand, this argument will be treated as an assignment rather than a

ﬁle argument.

ENVIRON Array of environment variables; subscripts are names. For example, if environ-

ment variable V=thing, ENVIRON["V"] produces thing

RSTART The starting position of the string matched by the

match function, numbering

from 1. This is always equivalent to the return value of the

match function.

RLENGTH The length of the string matched by the

match function.

Functions can be deﬁned (at the position of a pattern-action statement) as follows:

function foo(a, b, c) { ...; return x }

Parameters are passed by value if scalar, and by reference if array name. Functions can be called recur-

sively. Parameters are local to the function; all other variables are global.

Note that if pattern-action statements are used in an HP-UX command line as an argument to the

awk

command, the pattern-action statement must be enclosed in single quotes to protect it from the shell. For

example, to print lines longer than 72 characters, the pattern-action statement as used in a script (

-f

progﬁle command form) is:

length > 72

The same pattern action statement used as an argument to the awk command is quoted in this manner:

awk ’length > 72’

EXTERNAL INFLUENCES

Environment Variables

UNIX95 If deﬁned, speciﬁes to use the XPG4 behavior for this command. The changes for XPG4

include support for the entire behavior speciﬁed above and include the following behavioral

change:

• If CONVFMT is not speciﬁed and UNIX95 is set, %d is used as the internal conversion

format for numbers by default.

LANG Provides a default value for the internationalization variables that are unset or null. If

LANG is unset or null, the default value of "C" (see lang(5)) is used. If any of the interna-

tionalization variables contains an invalid setting, awk will behave as if all internationali-

zation variables are set to "C". See environ(5).

LC_ALL If set to a non-empty string value, overrides the values of all the other internationalization

variables.

LC_CTYPE Determines the interpretation of text as single and/or multi-byte characters, the

classiﬁcation of characters as printable, and the characters matched by character class

expressions in regular expressions.

LC_NUMERIC Determines the radix character used when interpreting numeric input, performing conver-

sion between numeric and string values and formatting numeric output. Regardless of

locale, the period character (the decimal-point character of the POSIX locale) is the

decimal-point character recognized in processing awk programs (including assignments in

command-line arguments).

LC_COLLATE Determines the locale for the behavior of ranges, equivalence classes and multi-character

collating elements within regular expressions.

LC_MESSAGES

Determines the locale that should be used to affect the format and contents of diagnostic

messages written to standard error and informative messages written to standard output.

NLSPATH Determines the location of message catalogues for the processing of LC_MESSAGES.

PATH

Determines the search path when looking for commands executed by system(cmd), or

input and output pipes.

HP-UX 11i Version 1: September 2005 − 4 − Hewlett-Packard Company Section 1−−37