Date: Wed, 18 Jul 2001 12:19:16 -0500 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> Subject: Re: one & and two && Message-ID: <002101c10fad$cbd6dee0$0301a8c0@resnet.purdue.edu> References: <20010718190539.U3625-100000@localhost.de>
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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 | > *--------------------------------------* > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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