awk.1 (2010 09)

awk(1) awk(1)

International Code Set Support

Single- and multi-byte character code sets are supported except that variable names must contain only

ASCII characters and regular expressions must contain only valid characters.

DIAGNOSTICS

awk supports up to 199 ﬁelds (

$1, $2, ..., $199) per record.

EXAMPLES

Print lines longer than 72 characters:

length > 72

Print ﬁrst two ﬁelds in opposite order:

{ print $2, $1 }

Same, with input ﬁelds separated by comma and/or blanks and tabs:

BEGIN { FS = ",[ \t]*|[ \t]+" }

{ print $2, $1 }

Add up ﬁrst column, print sum and average:

{s+=$1}"

END { print "sum is", s, " average is", s/NR }

Print all lines between start/stop pairs:

/start/, /stop/

Simulate echo command (see echo(1)):

BEGIN { # Simulate echo(1)

for (i = 1; i < ARGC; i++) printf "%s ", ARGV[i]

printf "\n"

exit }

WARNINGS

If the input line length to awk is greater than 3,000 bytes, then the behaviour is undeﬁned.

AUTHOR

awk was developed by AT&T, IBM, OSF, and HP.