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Test Your Knowledge in Computers #997
Difficulty: Medium
The use of hypervisor technology by malware and rootkits installing themselves as a hypervisor below the operating system is known as hyperjacking.
True or False?
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bup-on(1) [debian man page]

bup-on(1)						      General Commands Manual							 bup-on(1)

bup-on - run a bup server locally and client remotely SYNOPSIS
bup on <hostname> index ... bup on <hostname> save ... bup on <hostname> split ... DESCRIPTION
bup on runs the given bup command on the given host using ssh. It runs a bup server on the local machine, so that commands like bup save on the remote machine can back up to the local machine. (You don't need to provide a --remote option to bup save in order for this to work.) See bup-index(1), bup-save(1), and so on for details of how each subcommand works. This 'reverse mode' operation is useful when the machine being backed up isn't supposed to be able to ssh into the backup server. For example, your backup server can be hidden behind a one-way firewall on a private or dynamic IP address; using an ssh key, it can be autho- rized to ssh into each of your important machines. After connecting to each destination machine, it initiates a backup, receiving the resulting data and storing in its local repository. For example, if you run several virtual private Linux machines on a remote hosting provider, you could back them up to a local (much less expensive) computer in your basement. EXAMPLES
# First index the files on the remote server $ bup on myserver index -vux /etc bup server: reading from stdin. Indexing: 2465, done. bup: merging indexes (186668/186668), done. bup server: done # Now save the files from the remote server to the # local $BUP_DIR $ bup on myserver save -n myserver-backup /etc bup server: reading from stdin. bup server: command: 'list-indexes' PackIdxList: using 7 indexes. Saving: 100.00% (241/241k, 648/648 files), done. bup server: received 55 objects. Indexing objects: 100% (55/55), done. bup server: command: 'quit' bup server: done # Now we can look at the resulting repo on the local # machine $ bup ftp 'cat /myserver-backup/latest/etc/passwd' root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/bin/sh bin:x:2:2:bin:/bin:/bin/sh sys:x:3:3:sys:/dev:/bin/sh sync:x:4:65534:sync:/bin:/bin/sync ... SEE ALSO
bup-index(1), bup-save(1), bup-split(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <>. Bup unknown- bup-on(1)

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bup-random(1)						      General Commands Manual						     bup-random(1)

bup-random - generate a stream of random output SYNOPSIS
bup random [-S seed] [-fv] DESCRIPTION
bup random produces a stream of pseudorandom output bytes to stdout. Note: the bytes are not generated using a cryptographic algorithm and should never be used for security. Note that the stream of random bytes will be identical every time bup random is run, unless you provide a different seed value. This is intentional: the purpose of this program is to be able to run repeatable tests on large amounts of data, so we want identical data every time. bup random generates about 240 megabytes per second on a modern test system (Intel Core2), which is faster than you could achieve by read- ing data from most disks. Thus, it can be helpful when running microbenchmarks. OPTIONS
the number of bytes of data to generate. Can be used with the suffices k, M, or G to indicate kilobytes, megabytes, or gigabytes, respectively. -S, --seed=seed use the given value to seed the pseudorandom number generator. The generated output stream will be identical for every stream seeded with the same value. The default seed is 1. A seed value of 0 is equivalent to 1. -f, --force generate output even if stdout is a tty. (Generating random data to a tty is generally considered ill-advised, but you can do if you really want.) -v, --verbose print a progress message showing the number of bytes that has been output so far. EXAMPLES
$ bup random 1k | sha1sum 2108c55d0a2687c8dacf9192677c58437a55db71 - $ bup random -S1 1k | sha1sum 2108c55d0a2687c8dacf9192677c58437a55db71 - $ bup random -S2 1k | sha1sum f71acb90e135d98dad7efc136e8d2cc30573e71a - $ time bup random 1G >/dev/null Random: 1024 Mbytes, done. real 0m4.261s user 0m4.048s sys 0m0.172s $ bup random 1G | bup split -t --bench Random: 1024 Mbytes, done. bup: 1048576.00kbytes in 18.59 secs = 56417.78 kbytes/sec 1092599b9c7b2909652ef1e6edac0796bfbfc573 BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <>. Bup unknown- bup-random(1)

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