Portability issue

[DervishD]

    Hello all :))

    I have a portability problem with 'expr'. I have a script that
depends on 'expr', namely in the 'substr' expression, and I've noted
that this expression is not supported in the SUSv3 standard, so I
would like to know (if you have such information, of course) which
'expr's out there support 'substr' expressions in addition to the GNU
coreutils one, of course.

    Thanks a lot in advance, and as always, thanks for coreutils :)

    Raúl Núñez de Arenas Coronado

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