Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Mon, 12 May 2003 10:58:33 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	Sylvain DOT Ferriol AT imag DOT fr
cc:	cygwin AT cygwin DOT com
Subject:	Re: suggestion for cygutils - usermod (was Re: howto change home
	path in /etc/passwd)
In-Reply-To:	<1052751266.3ebfb5a2ca7f6@webmail.imag.fr>
Message-ID:	<Pine.GSO.4.44.0305121055540.393-100000@slinky.cs.nyu.edu>
Importance:	Normal
MIME-Version:	1.0

On Mon, 12 May 2003 Sylvain DOT Ferriol AT imag DOT fr wrote:

> Surlignage Max Bowsher <maxb AT ukf DOT net>:
>
> > Sylvain DOT Ferriol AT imag DOT fr wrote:
> > > Yes , because i don't want to create a shell doing this:
> > > grep -v $USERNAME /etc/passwd > /etc/passwd
> >
> sorry
> but i don't know with sed how to delete a line starting with $USER

For the record: "sed '/'$USER':/d".  However, grep is perfectly adequate.
What Max was warning you about was the shell redirection mechanism.  You'd
be safer using something like

  cp -p /etc/passwd /etc/passwd-bak-tmp && grep -v $USERNAME /etc/passwd-bak-tmp > /etc/passwd && rm -f /etc/passwd-bak-tmp

> > Care! That will leave you with an empty /etc/passwd.
> > The shell truncates /etc/passwd BEFORE grep reads it.
> >
> > > mkpasswd -l -u $USERNAME -p $HOME >> /etc/passwd
> > >
> > > sylvain
> >
> > Max.

Hope this helps,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

Knowledge is an unending adventure at the edge of uncertainty.
  -- Leto II


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -