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

[Andrew DeFaria <ADeFaria at Salira dot com>]

Bernard Kash wrote:

> "Igor Pechtchanski" <pechtcha@cs.nyu.edu> wrote in message
> news:<Pine.GSO.4.44.0305121055540.393-100000@slinky.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 $USERNAME 
> > /etc/passwd-bak-tmp > /etc/passwd && rm -f /etc/passwd-bak-tmp
> >    
>
> Unfortunately, if you have a user named Homer that uses
> 'home' as his userid, the grep will eliminate more users
> than you might expect.  A more realistic example might be
> two users 'ted' and 'ed' when modifying user 'ed'.
OK then grep -v "^$USERNAME:" /etc/passwd-bak-tmp ...

> Also, the mkuser -p option expects a base directory,
> so if $HOME is "/home/usrname" the resulting record
> will set HOME to "/home/username/username" 
>
> I've used awk delete a user from passwd...
>
> awk -F: -v usr=$USERNAME '{IGNORECASE=1; if($1 != usr) print $1;}'
> /etc/passwd
>
> BB
>
>  
>
> > > > 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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