09-17-2004
GREPing for Nulls
I just had a filesystem / file corruption issue on my HSP's server due to disk capacity limits and fileswapping. I discovered that certain files got corrupted when fileswapping was not successful and they ended up with a string of control characters, or what I believe to be nulls, in them.
Does anyone know the proper grep arguments for a complete directory file search to find all files containing "^@^@^@^@^@" where "^@" is what I believe to be nulls.
Thanks.
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DAR_CP(1) General Commands Manual DAR_CP(1)
NAME
dar_cp - disk archive copy
SYNOPSIS
dar_cp <source file> <destination file>
dar_cp -h
dar_cp -V
DESCRIPTION
dar_cp is similar to the standard 'cp' command, except it does not stop copying when an I/O error is met. Instead, it skips a bit further
and continues to copy the rest of the file, as much as possible.
dar_cp only accepts full filename (not directory) as argument. The reason of its existence in dar package is that you need it if you use
Parchive with dar and have a corruption on a CD-R or any other read-only medium. You need to copy the corrupted slice on a read-write
filesystem, for Parchive be able to repair it using slice associated redundancy files.
OPTIONS
-h Displays help usage.
-V Displays version information.
EXIT CODES
dar_cp exists with the following codes:
0 upon normal execution (be some corrupted parted skipped or not)
1 syntax error on command-line
2 could not open source or destination files
3 any other system error met during the copy
5 when some data could not be copied due to I/O error
SIGNALS
Any signal sent to dar_cp will abort the program immediately, there is no way to have a proper termination before the end of the process
SEE ALSO
dar(1), dar_xform(1), dar_manager(1), dar_slave(1)
KNOWN BUGS
None actually.
AUTHOR
http://dar.linux.free.fr/
Denis Corbin
France
Europe
3rd Berkeley Distribution FEB 24th, 2007 DAR_CP(1)