src/usr.bin/awk/awk.1 - diff

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Diff for /src/usr.bin/awk/awk.1 between version 1.54 and 1.55

version 1.54, 2020/06/26 21:50:06

version 1.55, 2020/06/27 14:04:58

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This is convenient when working with multi-line records.

.Pp

An input line is normally made up of fields separated by whitespace,

or by the regular expression

or by the value of the field separator

.Va FS .

.Va FS

at the time the line is read.

The fields are denoted

.Va $1 , $2 , ... ,

while

.Va $0

refers to the entire line.

.Va FS

is null, the input line is split into one field per character.

may be set to either a single character or a regular expression.

Lines are split into fields using the value of

As as special case, if

.Va FS

at the time the line is read.

is a single space

Because of this,

.Pq the default ,

fields will be split by one or more whitespace characters.

.Va FS

is usually set via the

is null, the input line is split into one field per character.

.Fl F

option or inside of a

.Ic BEGIN

block.

.Pp

Normally, any number of blanks separate fields.

In order to set the field separator to a single blank, use the

Line 171

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.Fl F

option with a value of

.Sq [t] .

The field separator is usually set via the

.Fl F

option or from inside a

.Ic BEGIN

block so that it takes effect before the input is read.

.Pp

A pattern-action statement has the form:

.Pp

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.It Va FNR

Ordinal number of the current record in the current file.

.It Va FS

Regular expression used to separate fields; also settable

Regular expression used to separate fields (default whitespace);

by option

also settable by option

.Fl F Ar fs .

.Fl F Ar fs

.It Va NF

Number of fields in the current record.

.Va $NF