Date: Thu, 05 Mar 2009 07:19:07 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Kurt Buff <kurt.buff@gmail.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>, "Vasadi I. Claudiu Florin" <claudiu.vasadi@gmail.com> Subject: Re: the "yes" comand Message-ID: <49AF7CEB.90901@infracaninophile.co.uk> In-Reply-To: <a9f4a3860903041615g40627c32t8d965df823b85918@mail.gmail.com> References: <op.uqak1hn5flcvyi@da1-desktop-x64> <4ad871310903041609n1542132es793320cb9e0a28e2@mail.gmail.com> <op.uqak9wxuflcvyi@da1-desktop-x64> <a9f4a3860903041615g40627c32t8d965df823b85918@mail.gmail.com>
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Kurt Buff wrote:
> On Wed, Mar 4, 2009 at 16:06, Vasadi I. Claudiu Florin
> <claudiu.vasadi@gmail.com> wrote:
>> Well , I noticed that, but it's a bit odd now isn't it. I mean, what's the
>> sense of having some darn letter printer out forever ? I found it kind of
>> silly If you ask me.
>
> But, incredibly useful if you actually write shell scripts - many
> programs want a 'y' for input from the stdin, and this will do that
> for you.
Here's an example. When upgrading FreeBSD, especially over a large delta
in version numbers, you will frequently need to delete old files etc. that
are no longer part of the base system. You are provided with a mechanism
to do that, viz:
# cd /usr/src
# make check-old
{prints out all old files, directories and libraries to be deleted}
# make delete-old
{prompts you to delete anything apart from shlibs which it won't touch}
However 'make delete-old' will ask you whether you want to delete each
and every individual file, which is tedious. If you decide from your
inspection of the 'make check-old' output that you don't want any of the
old files, you can just run:
# yes | make delete-old
Job done.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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