Re: [Help-bash] Question: Capturing command output (on-screen keyword colorizer/prettifier).

[Eric Blake]

[please don't top-post on technical lists]

On 10/05/2016 07:35 PM, Matthew Giassa wrote:
> I managed to get 99% of the way there. I used dup()/pipe()/dup2() and
> hooked fork() to redirect stdout for bash and child processes to a
> dedicated per-process pipe.

That's part of your problem. It's better to redirect the children to a
pty than a pipe, because some children (a prime example is 'ls')
intentionally behave differently based on whether stdout is a pipe or a tty.

If you want more experience with ptys, the 'expect' program is a great
example.  Opening a pty is the easiest way to pass ALL output from any
level of process descendant through your filtering code.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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