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From: Lundberg Christer <christer DOT lundberg AT scania DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Awk print statement alters the argument variable's content
Date: Thu, 12 Jan 2017 12:26:36 +0000
Message-ID: <2241d4bbc7904b6aaf52d33fa820eab2@SESOEX0018.global.scd.scania.com>
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This program run with GNU awk 4.1.4 (currently installed with Cygwin):

  awk '
    BEGIN { OFMT="%.8g"
            buf = 1+0.1
            buf = buf "a"
            print "Length before print:", length(buf)
            print buf " "
            print buf
            print buf " "
            print "Length after print:", length(buf)
          }
  '

produces the following output on our system:

Length before print: 4
1.1a 
1.1
1.1 
Length after print: 3

so it appears that the "print buf" statement unexpectedly alters the content of buf.
With awk 4.1.3, we got the expected output

Length before print: 4
1.1a 
1.1a
1.1a 
Length after print: 4


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