Date: Sun, 9 Sep 2001 13:38:00 -0700 From: Ulf Zimmermann <ulf@Alameda.net> To: Alfred Perlstein <bright@mu.org> Cc: Ulf Zimmermann <ulf@Alameda.net>, hackers@FreeBSD.org Subject: Re: Question about what programs to use in /etc/rc* Message-ID: <20010909133800.C1500@seven.alameda.net> In-Reply-To: <20010909131152.L2965@elvis.mu.org>; from bright@mu.org on Sun, Sep 09, 2001 at 01:11:52PM -0500 References: <20010909024721.B1500@seven.alameda.net> <20010909131152.L2965@elvis.mu.org>
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On Sun, Sep 09, 2001 at 01:11:52PM -0500, Alfred Perlstein wrote:
> * Ulf Zimmermann <ulf@Alameda.net> [010909 04:47] wrote:
> > Hello everyone.
> >
> > I am looking at some PRs and I am trying to come up with a solution to
> > submit a patch. I know how to use expr to test as tring in sh inside
> > of a /etc/rc* script, but what method would people recommend to remove
> > part of the string after expr confirmed that something is part of it ?
> >
> > These are some examples strings:
> >
> > "dhcp"
> > "dhcp media 10baseTX"
> > "media 10baseTX dhcp mediaopt half-duplex"
> >
> > The following code will get me inside a if condition:
> >
> > if [ `expr "${ifconfig_args}" : '.*[Dd][Hh][Cc][Pp].*'` -ne 0 ]; then
> >
> > ....
> >
> > fi
> >
> > What I would like to do inside the if .. fi is to remove "[Dd][Hh][Cc][Pp]"
> > from the string so that the rest of the options can be used to call ifconfig.
> > Otherwise the if .. fi will test if the string is then empty or just white
> > spaces and if so it will not do anything but set ${dhcp_interfaces}. If its
> > not empty it will call ifconfig with the extra options to set the interface.
> >
> > Awk/sed comes to mind but those are in /usr/bin and I am trying to avoid
> > that.
> >
> > Any suggestions from the more experienced hackers ?
>
> sed? :)
>
> sed 's/[Dd][Hh][Cc][Pp]//g'
>
> -Alfred
sed is in /usr/bin and so its not a too good idea to use it in a /etc/rc
script. There is sed also in /stand, can that be used ?
--
Regards, Ulf.
---------------------------------------------------------------------
Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-865-0204
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