awk - Unix, Linux Command---reference

The dynamic?width?and?prec?capabilities of the?ANSI?C?printf()?routines are supported. A*?in place of either the?width?or?prec?specifications causes their values to be taken from the argument list to?printf?or?sprintf(). To use a positional specifier with a dynamic width or precision,supply the?count$?after the?*?in the format string. For example,"%3$*2$.*1$s".

Special File Names

When doing I/O redirection from either?print?or?printf?into a file,or via?getline?from a file,?gawk?recognizes certain special filenames internally. These filenames allow access to open file descriptors inherited from?gawk’s parent process (usually the shell). These file names may also be used on the command line to name data files. The filenames are:

print "You blew it!" > "/dev/stderr"

whereas you would otherwise have to use

print "You blew it!" | "cat 1>&2"

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