Curious bash evaluation
Rodolfo Alcazar Portillo
nospaze at gmail.com
Mon Dec 27 17:30:24 UTC 2010
On Mon, 2010-12-27 at 10:46 -0600, inode0 wrote:
> On Mon, Dec 27, 2010 at 10:05 AM, Rodolfo Alcazar Portillo
> <nospaze at gmail.com> wrote:
> > Hello. See this:
> >
> > # A="echo 'hi'"
> >
> > # echo $($A)
> > 'hi'
>
> That seems rather convoluted. Are you sure you don't just want to
> "eval $A" anyway?
Very sure. Not "bash", nor "eval". Just simple command substitution.
Another reason: it's shorter. Another reason: It must be understood, not
just avoided in a micro$oft software fashion.
> I realize your example may be a simple abstraction of something more complex.
Of course. I'm building a short script from some string. The rest is
boring.
Another failing example:
> cat script
echo "hello"
> $(<script)
"hello"
The $(<file) form is documented in the manual:
http://www.faqs.org/docs/bashman/bashref_30.html
Thanks!
--
----------------------------------------------
Rodolfo Alcazar Portillo - nospaze at gmail.com
otbits.blogspot.com / counter.li.org: #367962
----------------------------------------------
Q. What's the difference between Batman and Bill Gates?
A. When Batman fought the Penguin, he won.
More information about the users
mailing list