Date: Fri, 1 Feb 2002 15:22:07 -0800 From: "Crist J. Clark" <cristjc@earthlink.net> To: Paul David Fardy <pdf@morgan.ucs.mun.ca> Cc: questions@FreeBSD.ORG, Eric Six <erics@sirsi.com> Subject: Re: Perl question... Message-ID: <20020201152207.C956@gohan.cjclark.org> In-Reply-To: <200202012054.g11KslkB001080@plato.ucs.mun.ca>; from pdf@morgan.ucs.mun.ca on Fri, Feb 01, 2002 at 05:24:46PM -0330 References: <200202012054.g11KslkB001080@plato.ucs.mun.ca>
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On Fri, Feb 01, 2002 at 05:24:46PM -0330, Paul David Fardy wrote:
> Eric Six <erics@sirsi.com> wrote:
> >> I have found ways to append lines to the file, but not to create a new
> >> one at the very beginning. Also, any ideas on how to automate doing
> >> this to all the files in each dir?
>
> "Crist J. Clark" <cristjc@earthlink.net> wrote:
> > ed(1) man. man ed.
> >
> > for FILE in $DIR; do
> > ed $DIR/$FILE <<"EOF"
> > 1i
> > $TTL value
> > .
> > wq
> > EOF
> > done
>
> I've been using Perl so much, I've forgotten some of my shell rules.
> I tested this code because I thought "$TTL" would result in the
> expansion of an undefined variable TTL. In Perl, it _would_ be a
> problem. In sh, it's fine.
It is not expanded because I quoted "EOF" as the here-doc
delimiter. If I had not, it would have been.
> But I think I'll still add a few notes.
>
> > for FILE in $DIR; do
> > ed $DIR/$FILE <<"EOF"
>
> This should, I think, be
>
> for file in *; do
> ed $file <<"EOF"
>
> or
>
> for file in */*; do
> ed $file <<"EOF"
Correct, I meant to write,
for FILE in $DIR/*; do
ed $FILE <<"EOF"
The first line was a typo. The second... guess I was typing too fast
and not proof reading, sorry.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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