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bash and sh-compatibility

Posted on 2002-05-15
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Last Modified: 2008-01-16
bash claims to be sh-compatible in it's man-page. This seems to be wrong:

     echo 1>file
and
     echo 0>file
and
     # as many other examples as you like ..

is valid sh syntax.

Does somebody know how to tell bash to be sh-compatible?
Or is there a free (GPL or whatever) sh for Linux?
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Question by:ahoffmann
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jlevie earned 100 total points
ID: 7012396
If you are talking about the differences with using echo under sh vs echo under bash then you aren't actually talking about shell incompatiblity. In some implementations of sh echo is a built in and in other's it isn't. Furthermore, each system seems to have a different idea of exactly what echo does and how it behaves. If you examine very many spohisticated multi-platform scripts (or try to write same) you'll find that they frequently go to a lot of trouble to figure out what flavor of echo is available.

I'd be interested in places that you see incompatibility that  only involve the standard Bourne shell commands.
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by:ahoffmann
ID: 7012505
damn, should have thought about built in echo, 'cause I'm used to some other dragons with it too ;-)

Anyway it behaves equal in both: bash and sh (Solaris, didn't check carefully)

> I'd be interested in places that you see incompatibility that  only involve the standard Bourne shell commands
see : command
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by:jlevie
ID: 7012828
Personally I've never found any cases of valid Bourne shell syntax that Bash wouldn't execute, assuming that builtin vs not-builtin aren't an issue. The reverse is not true. Bash has some features (e.g., export, etc) that Bourne shell doesn't.
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