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gawk Not in POSIX awkThe GNU implementation, gawk, adds a large number of features.
They can all be disabled with either the --traditional or
--posix options
(see Options).
A number of features have come and gone over the years. This section
summarizes the additional features over POSIX awk that are
in the current version of gawk.
ARGIND,
BINMODE,
ERRNO,
FIELDWIDTHS,
FPAT,
IGNORECASE,
LINT,
PROCINFO,
RT,
and
TEXTDOMAIN
variables
(see Built-in Variables)
FS and for the third
argument to split() to be null strings
(see Single Character Fields)
RS to be a regexp
(see Records)
awk
program source code
(see Nondecimal-numbers)
BEGINFILE and ENDFILE special patterns
(see BEGINFILE/ENDFILE)
switch statement
(see Switch Statement)
awk functions:
close() that allows closing one end
of a two-way pipe to a coprocess
(see Two-way I/O)
gsub() and sub() with --posix
length() function accepts an array argument
and returns the number of elements in the array
(see String Functions)
match() function
for capturing text-matching subexpressions within a regexp
(see String Functions)
printf formats for
making translations easier
(see Printf Ordering)
split() function’s additional optional fourth
argument, which is an array to hold the text of the field separators
(see String Functions)
gawk:
gensub(), patsplit(), and strtonum() functions
for more powerful text manipulation
(see String Functions)
asort() and asorti() functions for sorting arrays
(see Array Sorting)
mktime(), systime(), and strftime()
functions for working with timestamps
(see Time Functions)
and(),
compl(),
lshift(),
or(),
rshift(),
and
xor()
functions for bit manipulation
(see Bitwise Functions)
isarray() function to check if a variable is an array or not
(see Type Functions)
bindtextdomain(), dcgettext(), and dcngettext()
functions for internationalization
(see Programmer i18n)
AWKPATH environment variable for specifying a path search for
the -f command-line option
(see Options)
AWKLIBPATH environment variable for specifying a path search for
the -l command-line option
(see Options)
gawk version 4.0:
gawk version 4.1:
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