[Gllug] Attach a command to run on completion of another process

[Tom Schutzer-Weissmann]

If I'm  running a long compile process I sometimes do this:

~$ make && yay || oops

Where yay makes a happy sound and oops makes an unhappy one. Occasionally I 
forget, or I start a process I realise is going to take longer than 
anticipated. Is there a way to attach new commands to the outcome of one 
already running?

Thanks
Tom SW
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