(no subject)

[kpreid]

Every time you write “ | ” in shell, that's concurrent programming.

Comments

[wrog]

never mind that '&' is the real parallel composition operator

[kpreid.livejournal.com]

The only difference (outside of perhaps job control, which I admit ignorance upon) is what the std{in,out} are connected to.

But if you write “&”, you're thinking about concurrency, because that's its sole purpose. Not necessarily so with “|”.