Re: Is there a way to get the output of a function without an extra bash process?

[Chris F.A. Johnson]

On Sun, 10 May 2020, Peng Yu wrote:

> Hi,
>
> $(fun) by default will always use a new bash process. This is wasteful
> in certain cases. In there a way to use the existing bash process
> (without using a temp file)? Thanks.
>
> $ cat ./main2.sh
> #!/usr/bin/env bash
> # vim: set noexpandtab tabstop=2:
>
> set -v
> echo "$BASHPID"
> function f {
>         echo "$BASHPID"
> }
> echo "$(f)"
> $ ./main2.sh
> echo "$BASHPID"
> 32056
> function f {
>         echo "$BASHPID"
> }
> echo "$(f)"
> 32057

f()
{
 printf -v pid %s "$BASHPID"
}


--
   Chris F.A. Johnson                         <http://cfajohnson.com/>
   =========================== Author: ===============================
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
   Pro Bash Programming: Scripting the GNU/Linux shell (2009, Apress)