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Full Discussion: Make a copy of a file when someone tries to modify the file
Top Forums Shell Programming and Scripting Make a copy of a file when someone tries to modify the file Post 303043134 by mohtashims on Sunday 19th of January 2020 11:11:32 PM
Old 01-20-2020
Make a copy of a file when someone tries to modify the file
I wish to take a backup of the file when someone tries to modify a file say /tmp/test.txt using vi, vim, cat, copy, mv commands.

I'm aware of inotify which will notify me of any changes to the file however, I wish to make a backup before and not after the changes are made to the file.

I wish to avoid loop check and backup on the file as i believe it will be too time consuming.

Thus, whenever someone makes changes to a file there should exist its backup taken right before the file is modified.

Can you please let me know if and how this is possible to achieve ?

A solution that works across AiX / Linux systems would be great.
 

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LEARN ABOUT NETBSD

fssconfig

FSSCONFIG(8)						    BSD System Manager's Manual 					      FSSCONFIG(8)

NAME

     fssconfig -- configure file system snapshot devices

SYNOPSIS

     fssconfig [-cxv] device path backup [cluster [size]]
     fssconfig -u [-v] device
     fssconfig -l [-v] [device]

DESCRIPTION

     The fssconfig command configures file system snapshot pseudo disk devices.  It will associate the file system snapshot disk device with a
     snapshot of path allowing the latter to be accessed as though it were a disk.

     If backup resides on the snapshotted file system a persistent snapshot will be created.  This snapshot is active until backup is unlinked.
     This snapshot mode is only supported for ffs files systems.

     Otherwise data written through the path will be saved in backup.  If backup is a regular file, it will be created with length size.  Default
     size is the size of path.	Data is saved to backup in units of cluster bytes.

     Options indicate an action to be performed:

     -c   Configures the device.  If successful, references to device will access the contents of path at the time the snapshot was taken.  If
	  backup is a directory, a temporary file will be created in this directory.  This file will be unlinked on exit.

     -l   List the snapshot devices and indicate which ones are in use.  If a specific device is given, then only that will be described.

     -u   Unconfigures the device.

     -v   Be more verbose listing the snapshot devices.

     -x   Unlink backup after the device is configured.

     If no action option is given, -c is assumed.

FILES

     /dev/rfss?
     /dev/fss?

EXAMPLES

	   fssconfig fss0 /usr /tmp/back

     Configures the snapshot device fss0 for a snapshot of the /usr file system.  Data written through /usr will be backed up in /tmp/back.

	   fssconfig fss1 / /dev/rsd0e 8192

     Configures the snapshot device fss1 for a snapshot of the / file system.  Data written through / will be backed up in /dev/rsd0e.	The backup
     will take place in units of 8192 bytes.

	   fssconfig -u fss0

     Unconfigures the fss0 device.

SEE ALSO

     opendisk(3), fss(4), mount(8), umount(8)

HISTORY

     The fssconfig command appeared in NetBSD 2.0.

BSD
								   June 11, 2012							       BSD
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