12-30-2017
A reflection of
awk basics might help.
man awk:
Quote:
THE AWK LANGUAGE
1. Program structure
An AWK program is a sequence of pattern {action} pairs and user function definitions.
A pattern can be:
BEGIN
END
expression
expression , expression
FNR == 1 is such an expression; if its evaluation yields TRUE, the action following will be executed. So, NO
if needed in this
awk construct (although the
if statement is available for flow control in the action parts).
1- Reading files twice has been eliminated in post#12. Nevertheless, the trick was to append the actual file name to the
awk script's parameter list as described in post#9's comments.
2- Yes,
awk variables are being created / initiated the first time they're referenced.
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IGAWK(1) Utility Commands IGAWK(1)
NAME
igawk - gawk with include files
SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ...
igawk [ all gawk options ] [ -- ] program-text file ...
DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).
AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like
@include getopt.awk
in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.
OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports.
EXAMPLES
cat << EOF > test.awk
@include getopt.awk
BEGIN {
while (getopt(ARGC, ARGV, "am:q") != -1)
...
}
EOF
igawk -f test.awk
SEE ALSO
gawk(1)
Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.
AUTHOR
Arnold Robbins (arnold@skeeve.com).
Free Software Foundation Nov 3 1999 IGAWK(1)