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From: =?UTF-8?B?SsOpcsOpbWllIFJvcXVldA==?= <arkanosis@gmail.com>
Date: Tue, 13 Dec 2011 19:04:12 +0100
Message-ID: <CAFOazAOFiHs4SLhHFVFXesAHkyA0D-L18q8Qha2-hmd_xKk6Kw@mail.gmail.com>
Subject: Re: wait for the next process to finish
To: zsh-users@zsh.org
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2011/12/13 Anthony R Fletcher <arif@mail.nih.gov>:
> I was using this loop
>
> =C2=A0for f in *.txt
> =C2=A0do
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0what-ever-has-to-happen $f &
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pwait 20
> =C2=A0done
>
> where pwait is a function
>
> =C2=A0function pwait() {
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0while [ $(jobs -rp | wc -l) -ge $1 ]
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0do
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0# sleep 10
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0wait
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0done
> =C2=A0}
>
> (see http://superuser.com/questions/158165/parallel-shell-loops for one
> example amongst many).
>
> I was hoping that using "wait" would be better than using a "sleep 10".
> But wait waits for them all and not just he last to finish. The nice
> thing is that this is a small, easy loop and all the brains is in the
> barrier function pwait. Sadly a sleep for 10 seconds is completely
> arbitrary.

I'm wondering if you're not just looking for zargs :-)

autoload -U zargs
zargs -n 1 -P 20 *.txt -- what-ever-has-to-happen

Best regards,

--=20
J=C3=A9r=C3=A9mie