want file to regenerate after deletion Post: 302354295

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Top Forums Shell Programming and Scripting want file to regenerate after deletion Post 302354295 by Corona688 on Thursday 17th of September 2009 04:42:49 PM

09-17-2009

Registered User

There's no fundamental-to-the-system way to make a file that ressurects itself. If you want to leave a file alone, the natural thing to do is to stop trashing it! Smilie

And change file and directory permissions to prevent people from trashing it in the first place. I'm reminded of a story:

Quote:

From: tzs@stein.u.washington.edu (Tim Smith)
Organization: University of Washington, Seattle

I was working on a line printer spooler, which lived in /etc. I wanted to remove it, and so issued the command "rm /etc/lpspl." There was only one problem. Out of habit, I typed "passwd" after "/etc/" and removed the password file. Oops.

I called up the person who handled backups, and he restored the password file.

A couple of days later, I did it again! This time, after he restored it, he made a link, /etc/safe_from_tim.

About a week later, I overwrote /etc/passwd, rather than removing it.

After he restored it again, he installed a daemon that kept a copy of /etc/passwd, on another file system, and automatically restored it if it appeared to have been damaged.

Fortunately, I finished my work on /etc/lpspl around this time, so we didn't have to see if I could find a way to wipe out a couple of filesystems...

Corona688

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LEARN ABOUT NETBSD

yppasswdd

RPC.YPPASSWDD(8)					    BSD System Manager's Manual 					  RPC.YPPASSWDD(8)

NAME

     rpc.yppasswdd -- NIS update password file daemon

SYNOPSIS

     rpc.yppasswdd [-d directory] [-noshell] [-nogecos] [-nopw] [-m arg1 [arg2 ...]]

DESCRIPTION

     rpc.yppasswdd must be running on the NIS master server to allow users to change information in the password file.

     The options are as follows:

	   -d directory    Change the root directory of the password file from ``/'' to directory.  It is important to create the binary database
			   files (pwd.db and spwd.db) when using this switch or the password change will fail.	The databases need to be created
			   only once with the following command:

				 pwd_mkdb -d directory directory/etc/master.passwd

	   -noshell	   Don't allow changes of the shell field in the passwd file.

	   -nogecos	   Don't allow changes of the gecos field in the passwd file.

	   -nopw	   Don't allow changes of the password in the passwd file.

	   -m arg1 [arg2 ...]
			   Additional arguments to pass to make in /var/yp.

FILES

     /etc/passwd
     /etc/master.passwd

SEE ALSO

     chpass(1), passwd(1), hosts_access(5), nis(8), ypbind(8), ypserv(8)

AUTHORS

     Mats O Jansson <moj@stacken.kth.se>

BSD
								 February 26, 2005							       BSD