09-13-2012
Not a command, no. What guarantee would you have that you caught it at the right instant? You need something more fundamental.
Linux can do so at the filesystem level with
NILFS, a snapshotting filesystem which keeps past versions of files in case you need them. Each snapshot is independently accessible.
It'd be a big space waster for files that change often of course! A huge file that completely changes all the time would take a lot of space to snapshot.
Last edited by Corona688; 09-13-2012 at 02:49 PM..
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LEARN ABOUT DEBIAN
snapconv
snapconv(1) Emulators snapconv(1)
NAME
snapconv - Sinclair ZX Spectrum snapshot converter
SYNOPSIS
snapconv [ -c ] [ -n ] infile outfile
DESCRIPTION
snapconv converts between ZX Spectrum snapshot files.
OPTIONS
-c specifies that all data in the output snapshot should be compressed, even if that compression will result in a bigger file than if
some data is left uncompressed. This helps compatibility with some buggy programs that can only read entirely compressed .z80 files.
-n specifies that the output snapshot should be uncompressed.
-f specifies that the A and F and A' and F' registers should be swapped. Version 0.5.0 and older of libspectrum(3) had a bug that
resulted in these registers being swapped in SZX snapshots only. Version 0.5.1 and newer of libspectrum(3) automatically recognise
these snapshots and correct the problem, but this flag is necessary to fix some snapshots created by development versions only of
libspectrum(3) which had the bug fixed, but cannot be distinguished from snapshots containing the bug.
infile specifies the snapshot to be converted. This file can be in any of the snapshot formats supported by libspectrum(3).
outfile
specifies the output snapshot. The format will be determined by the file extension and can be in any of the formats libspectrum(3)
supports for output.
BUGS
None known.
SEE ALSO
fuse(1), fuse-utils(1), libspectrum(3), listbasic(1), snap2tzx(1)
The comp.sys.sinclair Spectrum FAQ, at
http://www.worldofspectrum.org/faq/index.html.
AUTHOR
Philip Kendall (philip-fuse@shadowmagic.org.uk).
Version 1.0.0 16th December, 2010 snapconv(1)