suggestion for cygutils - usermod (was Re: howto change home path in /etc/passwd)
Igor Pechtchanski
pechtcha@cs.nyu.edu
Mon May 12 15:10:00 GMT 2003
On Mon, 12 May 2003 Sylvain.Ferriol@imag.fr wrote:
> Surlignage Max Bowsher <maxb@ukf.net>:
>
> > Sylvain.Ferriol@imag.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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