Mailinglist Archive: radeonhd (529 mails)

[Hans Ulrich Niedermann <hun@xxxxxxxxxxxxxxxx>]

Matthias Hopf wrote:
> On Dec 01, 07 02:44:09 +0100, Hans Ulrich Niedermann wrote:
> >  working_dir="$(pwd)"
>
> Just as I see this - $(cmd) is a bash extension AFAIK. Better use
> "`cmd`".

$(cmd) is not a bashism. $(cmd) is POSIX sh, and is supported by most
shs even if they are not strictly POSIX in other ways.

The one sh that does not grok $(cmd) is the Solaris /bin/sh. However,
Solaris has a working sh in /usr/iforgotwhatitwaswith4/bin/sh, so they
can just SHELL=/usr/iforgotwhatitwaswith4/bin/sh and it will work for them.

Correct quoting with $() is easy (for file and directory names with
spaces e.g.). Correct quoting and escaping with `` frankly escapes me,
though, and IIRC there were some things that could not be quoted
correctly at all with ``. You're welcome to help me there, of course.

I personally think the benefits of the correct nesting and quoting of
$() far outweigh that users of the single system with the
broken-by-default sh have to explicitly specify the functional sh that
is sitting just two directories away.

E.g. git's scripts use sh functions and $() substitution.

-- 
Hans Ulrich Niedermann