ptx: implement GNU extensions

[ycd]

ptx has -G --traditional flags to specify to whether use traditional mode or GNU extensions, our ptx implementation doesn't supports GNU extensions yet. In traditional mode, there are only several flags available -b, -f, -g, -i, -o, -r, -t and -w, all the other options needs GNU extensions to be implemented.

FLAGS:
    -G, --traditional        behave more like System V 'ptx'

Code is in: https://github.com/uutils/coreutils/tree/master/src/uu/ptx

GNU's documentation for ptx.

There is also a great documentation available from GNU about: The GNU extensions to ptx.

[stale[bot]]

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