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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
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! 
And change file and directory permissions to prevent people from trashing it in the first place. I'm reminded of a story:
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...
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...
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LEARN ABOUT DEBIAN
bup-restore
bup-restore(1) General Commands Manual bup-restore(1) NAME
bup-restore - extract files from a backup set SYNOPSIS
bup restore [--outdir=outdir] [-v] [-q] DESCRIPTION
bup restore extracts files from a backup set (created with bup-save(1)) to the local filesystem. The specified paths are of the form /branch/revision/path/to/file. The components of the path are as follows: branch the name of the backup set to restore from; this corresponds to the --name (-n) option to bup save. revision the revision of the backup set to restore. The revision latest is always the most recent backup on the given branch. You can dis- cover other revisions using bup ls /branch. /path/to/file the original absolute filesystem path to the file you want to restore. For example, /etc/passwd. Note: if the /path/to/file is a directory, bup restore will restore that directory as well as recursively restoring all its contents. If /path/to/file is a directory ending in a slash (ie. /path/to/dir/), bup restore will restore the children of that directory directly to the current directory (or the --outdir). If the directory does not end in a slash, the children will be restored to a subdirectory of the current directory. See the EXAMPLES section to see how this works. OPTIONS
-C, --outdir=outdir create and change to directory outdir before extracting the files. -v, --verbose increase log output. Given once, prints every directory as it is restored; given twice, prints every file and directory. -q, --quiet don't show the progress meter. Normally, is stderr is a tty, a progress display is printed that shows the total number of files restored. EXAMPLE
Create a simple test backup set: $ bup index -u /etc $ bup save -n mybackup /etc/passwd /etc/profile Restore just one file: $ bup restore /mybackup/latest/etc/passwd Restoring: 1, done. $ ls -l passwd -rw-r--r-- 1 apenwarr apenwarr 1478 2010-09-08 03:06 passwd Restore the whole directory (no trailing slash): $ bup restore -C test1 /mybackup/latest/etc Restoring: 3, done. $ find test1 test1 test1/etc test1/etc/passwd test1/etc/profile Restore the whole directory (trailing slash): $ bup restore -C test2 /mybackup/latest/etc/ Restoring: 2, done. $ find test2 test2 test2/passwd test2/profile SEE ALSO
bup-save(1), bup-ftp(1), bup-fuse(1), bup-web(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-restore(1)