Richard Melville wrote:
On 11 June 2017 at 17:06, Bruce Dubbs <[email protected]
$() is specific to bash. We try to keep the boot scripts Bourne Shell
compatible. I agree that $() is generally preferable, but not here.
Bruce, thanks for your answer. I wasn't going to reply as it seems a
little like nit-picking, but, as {,B}LFS is primarily an educational
resource, I felt that your statement needed correcting, for the benefit of
newcomers. They would be led to believe that they could not use $() for
any shell other than bash, but $() isn't a construct that's "specific to
bash". AFAIK all modern shells can use that command substitution
construct. Indeed, bash borrowed the construct from the Korn shell is the
first place. I can understand your desire for backwards compatibility,
but "Bourne Shell compatible" seems to me to be taking things a little too
far. Besides, the $() construct is Posix compatible.
OK, my mistake. I didn't test it. In dash 'echo $(ls)' does work.
Learned something today.
There are 38 instances of using `command` in the boot scripts. I do not
know if it is worthwhile changing them or not. The scripts have been
working pretty well since LFS 7.0 in 2011.
-- Bruce
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