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Message-ID: <B5D0B243841E0B4BA7BFCE18D244FFA32A9F0E@intexchg.isdomain.intrsoft.com>
From: Bernard Kash <bkash AT intersoftcorporation DOT com>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: Re: suggestion for cygutils - usermod (was Re: howto change home 
	 path in /etc/passwd)
Date: Mon, 12 May 2003 12:42:22 -0500
MIME-Version: 1.0
Content-Type: text/plain

"Igor Pechtchanski" <pechtcha AT cs DOT nyu DOT edu> wrote in message
news:<Pine DOT GSO DOT 4 DOT 44 DOT 0305121055540 DOT 393-100000 AT slinky DOT cs DOT nyu DOT edu>...
> 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

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'.

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 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
> 
> 

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