Paul Smith c7b469f0f3 - Enhance .POSIX to set -e when invoking shells, as demanded by a ...

backward-incompatible change in the 2008 POSIX specification.
- Add the .SHELLFLAGS variable so people can choose their own shell flags.
- Add tests for this.
- Add documentation for this.

2010-07-06 06:37:42 +00:00

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