Re: Parameter expansion with extended pattern make system hang

[Chet Ramey]

On 9/4/22 10:48 PM, Hyunho Cho wrote:

> Bash Version: 5.1
> Patch Level: 16
> Release Status: release
>
> ##############################################################
>
>
> #### "gcc --help" is already a short string, but the system hangs.
> ( without using extended pattern, there is no such problem )
>
> bash$ help=$( gcc --help )
>
> bash$ echo "${help//+([$' \t\n'])/ }"

If you want the output in a single string, this is a two-liner with sed and
mapfile, and it runs the 90K output of gcc --help in about a tenth of a
second on my machine.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/