05-27-2006
Quote:
Originally Posted by raghukayyar
Are there any other UNIX commands (apart from '>filename) which can be used to clear the file contents?
There is some command called shred which overrides file's contents, but it's not effective with many filesystems suchs as JFS, XFS, ReiserFS... and those which doesn't overwrite data in place.
Salut
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SHRED(1) User Commands SHRED(1)
NAME
shred - overwrite a file to hide its contents, and optionally delete it
SYNOPSIS
shred [OPTION]... FILE...
DESCRIPTION
Overwrite the specified FILE(s) repeatedly, in order to make it harder for even very expensive hardware probing to recover the data.
If FILE is -, shred standard output.
Mandatory arguments to long options are mandatory for short options too.
-f, --force
change permissions to allow writing if necessary
-n, --iterations=N
overwrite N times instead of the default (3)
--random-source=FILE
get random bytes from FILE
-s, --size=N
shred this many bytes (suffixes like K, M, G accepted)
-u truncate and remove file after overwriting
--remove[=HOW]
like -u but give control on HOW to delete; See below
-v, --verbose
show progress
-x, --exact
do not round file sizes up to the next full block;
this is the default for non-regular files
-z, --zero
add a final overwrite with zeros to hide shredding
--help display this help and exit
--version
output version information and exit
Delete FILE(s) if --remove (-u) is specified. The default is not to remove the files because it is common to operate on device files like
/dev/hda, and those files usually should not be removed. The optional HOW parameter indicates how to remove a directory entry: 'unlink' =>
use a standard unlink call. 'wipe' => also first obfuscate bytes in the name. 'wipesync' => also sync each obfuscated byte to disk. The
default mode is 'wipesync', but note it can be expensive.
CAUTION: Note that shred relies on a very important assumption: that the file system overwrites data in place. This is the traditional way
to do things, but many modern file system designs do not satisfy this assumption. The following are examples of file systems on which
shred is not effective, or is not guaranteed to be effective in all file system modes:
* log-structured or journaled file systems, such as those supplied with AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)
* file systems that write redundant data and carry on even if some writes fail, such as RAID-based file systems
* file systems that make snapshots, such as Network Appliance's NFS server
* file systems that cache in temporary locations, such as NFS version 3 clients
* compressed file systems
In the case of ext3 file systems, the above disclaimer applies (and shred is thus of limited effectiveness) only in data=journal mode,
which journals file data in addition to just metadata. In both the data=ordered (default) and data=writeback modes, shred works as usual.
Ext3 journaling modes can be changed by adding the data=something option to the mount options for a particular file system in the
/etc/fstab file, as documented in the mount man page (man mount).
In addition, file system backups and remote mirrors may contain copies of the file that cannot be removed, and that will allow a shredded
file to be recovered later.
AUTHOR
Written by Colin Plumb.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report shred translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/shred>
or available locally via: info '(coreutils) shred invocation'
GNU coreutils 8.28 January 2018 SHRED(1)