Re: [Help-bash] Use one line for myvar=XXX cat <(echo "$myvar")

[Dan Douglas]

On Sunday, July 21, 2013 07:53:33 PM Peng Yu wrote:
> Hi,
> 
> myvar=XXX cat <(echo "$myvar")
> 
> myvar in <() won't get the value XXX. I could use export to split the
> above line into two lines as in the following.
> 
> export myvar=XXX
> cat <(echo "$myvar")
> 
> But is there an one line command for it? Thanks.
> 

Bash will hold open the fd in certain cases.

 $ x=foo y=<(echo "$x") command eval cat '"$y" - <<<"$x"'
foo
foo

The scoping rules differ from variable scope somewhat. The rules I could 
deduce (a few years ago) are here:
http://wiki.bash-hackers.org/syntax/expansion/proc_subst#scope

-- 
Dan Douglas