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From: Andrew DeFaria <ADeFaria AT Salira DOT com>
Subject: Re: suggestion for cygutils - usermod (was Re: howto change home
     path in /etc/passwd)
Date: Mon, 12 May 2003 14:52:04 -0700
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Bernard Kash wrote:

>"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 $USERNAME 
>>/etc/passwd-bak-tmp > /etc/passwd && rm -f /etc/passwd-bak-tmp
>>    
>>
>
>Unfortunately, if you have a user named Homer that uses
>'home' as his userid, the grep will eliminate more users
>than you might expect.  A more realistic example might be
>two users 'ted' and 'ed' when modifying user 'ed'.
>
OK then grep -v "^$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 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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