09-25-2014
You're welcome. It is not entirely surprising.. If the variable a is not initialized then it is the empty string ("").. So $a becomes $"".
Some awks may interpret it in a numerical context and change it to 0 and so it turns into $0 (which is the record), which would give the proper answer, but it would work differently from what you might expect...
Other awks may not accept $"" and raise an error message
Yet other awks may assign it to $0 (because it is a numerical context), but reference $"" which may return 0, etc...
It is an ambiguous situation and it really depends on the specific awk implementation how this improper use of the variable gets handled..
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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)