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want file to regenerate after deletion


 
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# 1  
Old 09-17-2009
want file to regenerate after deletion

I looked into the sticky bit, but I think, if possible, that I would prefer to have the file recreate itself after deletion. The file is several directories deep, and from time to time the top level directory will be trashed. I need the file to recreate after this. Is it possible to perhaps create a symlink that, if the file is deleted, the source file will recreate it?

---------- Post updated at 03:33 PM ---------- Previous update was at 02:56 PM ----------

Any ideas are welcome!
# 2  
Old 09-17-2009
Do you want the file contents re-created or just a the file? If just the file, have a script that checks to see if the target file exists and if not, touch $file. If you want the contents as well, have a similar script that checks for existence and if it isn't there, copy a new one in place. From what you say you'll probably have to create the directory structure as well. Have a look at mkdir -p for that.
# 3  
Old 09-17-2009
peterro, Thanks for answering.. I was wondering if there was something simpler.. Like a way to actually have a symlink that, if the target file was deleted, that the source file would recreate it.
# 4  
Old 09-17-2009
Can you give more details? What is trashing your directory structure? Is this just a blank file, or a log file that you will be writing to when needed? I don't understand why you'd want to keep recreating a dir structure and a file. Without knowing more I'd tend to agree with peterro's comments.
# 5  
Old 09-17-2009
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...
# 6  
Old 09-17-2009
try using hard links.

ie:
Code:
ln /myfs/protected/directory/master.file /myfs/dir/that/might/be/trashed/your.copy.file

if your.copy.file gets removed, you can just create another link. keep master.file in a safe place and you will always have at least one file there. the files must exist on the same file system though. the file will only be unlinked if all references are removed.
# 7  
Old 09-18-2009
I am using a link. This file is a userChrome.css file within a user's firefox profile that is configured to disable/remove the network settings button so that users arent changing their proxy settings. The problem is sometimes the users' firefox profile gets corrupted and we trash it. When firefox starts up after that, it creates a new profile, minus the userChrome.css file which is custom. I was hoping I could use a linked userchrome file in their profile, and if it was deleted, to have it somehow regenerate from the destination linked file. basically a link that when broken, fixes itself.

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