03-10-2019
Quote:
Originally Posted by
RudiC
On top of what Don Cragun said, the last approach would not account for "duplicate duplicates".
Hi RudiC,
I'm not sure what you mean. I don't see any reason why the code shown in post #7 should fail as long as all of the following are true:
- There are only "D" and "T" records in the input file.
- There is only one "T" record in the input file.
- The "T" record is the last record in the input file.
- The awk being used returns the number of elements in the array when length(array_name) is called.
The first three are true in the sample data provided in this thread. The fourth is true with
gawk starting with version 3.1.5 according to the
Linux 2.6 gawk man page available in the UNIX and Linux Man Pages repository. By experiment, it also works on the
awk version 20070501 provided with macOS Mojave version 10.14.3.
Unlike the code in post #5, this code is not subtracting the number of duplicates found, it is directly setting the number of unique elements found.
Am I missing something?
This User Gave Thanks to Don Cragun For This Post:
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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)