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Re: suggestion for cygutils - usermod (was Re: howto change home path in /etc/passwd)


Surlignage Igor Pechtchanski <pechtcha@cs.nyu.edu>:

> 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
> 
is it better to use $USER or $USERNAME??

sylvain
> > > 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@cs.nyu.edu
> ZZZzz /,`.-'`'    -.  ;-;;,_		igor@watson.ibm.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
> 
> 




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