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Re: Doubt about expr
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From: |
Eric Blake |
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Subject: |
Re: Doubt about expr |
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Date: |
Wed, 13 Sep 2006 07:21:13 -0600 |
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According to Sebastian Kreft on 9/12/2006 8:51 PM:
> I don't know if it is a standard of expr, but I think that is not intuitive
> to write a plus symbol before the string substr if I want to get the length
> of it.
POSIX states "The use of string arguments length, substr, index, or match
produces unspecified results."
(http://www.opengroup.org/onlinepubs/009695399/utilities/expr.html) This
is because these four strings can also be operators. The + is necessary
to tell expr that you want it interpreted as a string, not an operator.
- --
Life is short - so eat dessert first!
Eric Blake address@hidden
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