On 2012-07-26 Piotr Stanczyk <[email protected]> wrote:
> From: [email protected]
> [[email protected]] on behalf of Andreas
> Metzler [[email protected]]
>> Find attached a trivial patch against the four bootstrap scripts,
>> fixing a unnecessary bashism.
> Thanks for the patches. I had a quick look at them and noticed that
> the '==' operator has been replaced by '=' one. Could you provide a
> little more information as to the rationale behind this.
Good morning,
No problem.
[ or test are usually shell-builtins. Bash's builtin' version offers
some enhancements, including the fact that it allows to use "=="
instead of "=" for string comparison. However other POSIX compatible
sh-shells (notably dash) do not. On Ubuntu and Debian /bin/sh is not
Bash, and the command fails:
ametzler@argenau:/tmp/ilmbase$ ./bootstrap
./bootstrap: 4: [: Linux: unexpected operator
bash(1) says about this:
CONDITIONAL EXPRESSIONS
Conditional expressions are used by the [[ compound command and the
test and [ builtin commands to test file attributes and
perform string and arithmetic comparisons.
[...]
string1 == string2
string1 = string2
True if the strings are equal. = should be used with
the test command for POSIX conformance.
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html
thanks, cu andreas
--
`What a good friend you are to him, Dr. Maturin. His other friends are
so grateful to you.'
`I sew his ears on from time to time, sure'
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