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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
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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
-- 
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