Which just fills all available disk space with zeroes. You might want to follow with
to overwrite with random data.
Note, if the machine in question is an ssh or https server, you don't want to exhaust the available entropy; consider generating one one machine and piping through ssh onto the other.
Note also that if this involves the root filesystem or a multi-user system this will cause problems when the disk fills. Think carefully before doing this on critical systems.
Rather new to unix, so please don't beat me!
I'm trying to get a list of files into a variable that I can use throughout the rest of the script. The challenge is that I need to exclude a certain extension from the list, and I'm having trouble with it. For example:
item_a
item_a.exe... (3 Replies)
In my system , there is a script seems have a minor problem but I can't find it out , now everytime run the script , it will generate some error message to the system log , is it possible to forbid it generate the error to the system log or put all these message to /dev/null ? thx (3 Replies)
the file /etc/passwd has corrupted mistakenly.actually the file has saved as "oot:0:0:root:/root/sbin/bash".
first r of root has been deleted ..
can anyone tell me how can i recover as normal user (2 Replies)
Hello World!
I am writing code in C++ which have to launch another application X using exec().
I would like to set some limits on it using setrlimit etc...
My problem is that i don't know how to forbid using fork() and strlimit by application X.
How can i do it? (3 Replies)
Hello friends
I have an CentosOS 5 box running Apache, I want to Install a powerful File Integrity checker with recovery option to maintain any changes may be happened without my hand
Could you help me to recommend such solution
Thanks (3 Replies)
Hi ALL,
I'm encountering this problem on HP Shell (tcsh) environment.
Once I enter in vi to edit a file and add my sql script, like this:
sqlplus user/pass @promo.sql(tu run my script)
the @ character is not possible to write.
I push on the key but is not written inside.
Also in sqlplus... (3 Replies)
is it possible to recovery a deleted file in AIX? (2 Replies)
Discussion started by: fiyas
2 Replies
LEARN ABOUT REDHAT
shred
SHRED(1) FSF SHRED(1)NAME
shred - delete a file securely, first overwriting it to hide its contents
SYNOPSIS
shred [OPTIONS] FILE [...]
DESCRIPTION
Overwrite the specified FILE(s) repeatedly, in order to make it harder for even very expensive hardware probing to recover the data.
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 (25)
-s, --size=N
shred this many bytes (suffixes like K, M, G accepted)
-u, --remove
truncate and remove file after overwriting
-v, --verbose
show progress
-x, --exact
do not round file sizes up to the next full block
-z, --zero
add a final overwrite with zeros to hide shredding
- shred standard output
--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. When operating on regular files, most people use the --remove option.
CAUTION: Note that shred relies on a very important assumption: that the filesystem overwrites data in place. This is the traditional way
to do things, but many modern filesystem designs do not satisfy this assumption. The following are examples of filesystems on which shred
is not effective:
* log-structured or journaled filesystems, such as those supplied with
AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)
* filesystems that write redundant data and carry on even if some writes
fail, such as RAID-based filesystems
* filesystems that make snapshots, such as Network Appliance's NFS server
* filesystems that cache in temporary locations, such as NFS
version 3 clients
* compressed filesystems
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
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for shred is maintained as a Texinfo manual. If the info and shred programs are properly installed at your site,
the command
info shred
should give you access to the complete manual.
shred (coreutils) 4.5.3 February 2003 SHRED(1)