[Bug 257288] awk - loop over array index goes in reverse

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 19 Jul 2021 21:25:43 UTC

            Bug ID: 257288
           Summary: awk - loop over array index goes in reverse
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: parv.0zero9+freebsd@gmail.com

Created attachment 226558
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=226558&action=edit
awk on FreeBSD 12, 13 printed lines in reverse order while iterating over array

While trying to print lines with distinct second field in a line to keep only
the latest lines with 3 fields, the for-loop goes over the array variable in
reverse order surprisingly ...

  cat <<_LINE | /usr/bin/awk '{ line[$2] = $0 } END { for ( i in line ) { print
line[i] } }'
  10:09:58   18.1T   pool
  10:09:59   18.1T   pool
  10:43:45   18.2T   pool
  10:43:46   18.2T   pool
  10:43:46   18.2T   pool
  10:09:59   18.1T   pool

... I found this behaviour of /usr/bin/awk both on FreeBSD 12.2-RELEASE-p7 &
13-STABLE c 20210628.

OTOH, there was no such unexpected surprise from lang/gawk 5.1.0, which printed

  10:09:59   18.1T   pool
  10:43:46   18.2T   pool

Attached is the test shell script.

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