Just stumbled over a terrible feature in nawk derivates. I did not find it documented in man pages.
HP-UX 11.31:
Solaris 10:
I hope this is not implemented in any Posix or GNU awk version...
Last edited by MadeInGermany; 04-28-2015 at 11:24 AM..
Reason: OS version
The POSIX standards for awk specify that it must behave as if it uses (at least) double precision floating point values as defined by the C Standard. When ptr points to a string starting with a case insensitive "infinity", "inf", or "NaN", the C standard requires strtod(ptr, endptr) to set endptr to point to the character after the last character matched from one of those three strings and return the double precision floating point format representation for an infinity, infinity, or Not A Number, respectively, on systems that also support the IEEE 754 floating point standard.
So, yes, POSIX requires what was reported on HP/UX and Solaris systems. (Note, however, that the POSIX conforming version of awk on Solaris systems is /usr/xpg4/bin/awk; not nawk.) I'm not sure where the "Q" in NaNQ reported on AIX is coming from. The gawk output shown on Windows appears to be non-conforming.
And, for the record, on OS X Yosemite 10.10.3, the output from those three commands is, respectively:
These 4 Users Gave Thanks to Don Cragun For This Post:
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Sample Code
========
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nawk{
.
.
.
count=count+1
print count
}
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