From owner-freebsd-questions  Wed Jul 18 10:21:13 2001
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From: "Shwim" <shwim@purdue.edu>
To: "P. U. (Uli) Kruppa" <root@pukruppa.de>,
	"angela" <angelayu@ca.inter.net>
Cc: "Lanny Baron" <lnb@FreeBSDsystems.COM>,
	<freebsd-questions@FreeBSD.ORG>
References: <20010718190539.U3625-100000@localhost.de>
Subject: Re: one & and two &&
Date: Wed, 18 Jul 2001 12:19:16 -0500
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Of course in most shells,

& = set into background  <command a> &

&& = pretty much the same as below  <command a> && <command b>
where you execute command b if command a successfully executes

I'm guessing since you're asking this mailing list, you wanted to know the
common
shell implementations used in FreeBSD.

Shwim

----- Original Message -----
From: "P. U. (Uli) Kruppa" <root@pukruppa.de>
To: "angela" <angelayu@ca.inter.net>
Cc: "Lanny Baron" <lnb@FreeBSDsystems.COM>; <freebsd-questions@FreeBSD.ORG>
Sent: Wednesday, July 18, 2001 2:11 PM
Subject: Re: one & and two &&


> On Wed, 18 Jul 2001, angela wrote:
>
> > Date: Wed, 18 Jul 2001 12:43:03 -0400
> > From: angela <angelayu@ca.inter.net>
> > To: Lanny Baron <lnb@FreeBSDsystems.COM>,
> >      "freebsd-questions@FreeBSD.ORG" <freebsd-questions@FreeBSD.ORG>
> > Subject: one & and two &&
> >
> > Hi Lanny Baron
> >
> >
> > What is differenet one '&' and two '&&'
> & is the logical "and" condition:
> a&b=true if (a=true and b=true)
> (both a and b are checked)
>
> && is a 'technical' "and" condition:
> only check b=true if a=true (anything else would be a waste
> of time)
>
>
> Uli.
>
>
> *--------------------------------------*
> |  www.pukruppa.de       www.2000d.de  |
> |          Wuppertal - Germany         |
> *--------------------------------------*
>
>
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