jtreg unit/regression tests: Shell scripts under CYGWIN

[Joseph D. Darcy]

Brad Wetmore wrote:
>
> I know I'm approaching "Holy War" territory, but developers are 
> starting to use Cygwin instead of MKS for their windows build 
> environments.
>
> Many of our existing test shell scripts contain the following pattern:
>
> OS=`uname -s`
> case "$OS" in
>   SunOS | Linux )
>     NULL=/dev/null
>     PS=":"
>     FS="/"
>     TMP=/tmp
>     ;;
>   Windows_* )
>     NULL=NUL
>     PS=";"
>     FS="\\"
>     TMP="c:/temp"
>     ;;
>   * )
>     echo "Unrecognized operating system!"
>     exit 1;
>     ;;
> esac
>
> This will fail on CYGWIN, as `uname -s` returns "CYGWIN_NT-5.1".  The 
> fix is to update the Windows_* line to include CYGWIN:
>
>   Windows_* | CYGWIN* )
>
> Please do this when writing new tests or updating existing ones.

And it would be a fine little project if someone wanted to add the 
Cygwin support proactively to all the shell regression tests!

-Joe