Scoping problems in different shell languages?

Question

It appears that pdksh and mksh has the scoping implementation I expected.

For example:

readonly x='global' f() { local x readonly x='f' echo $x } g() { local x readonly x='g' echo $x } echo $x f g echo $x

pdksh and mksh produce my expected result:

global f g global

And Bash fails:

line 5: local: x: readonly variable

Dash and Ksh93 failed my expect, too. (I've changed local to typeset in Ksh93's test.)

This seems confusing.

UPDATE: I've edited the question. The question before is not stated in a clear way.

Dennis Williamson · Accepted Answer · 2011-02-15 17:45:54Z

1

Bash and Dash don't fail if the global variable is not read only.

Korn (ksh93) doesn't fail only if none of the instances of x are read only.

answered Feb 15, 2011 at 17:45

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