10-09-2019
The command connects to a remote server, does and ls -l of a directory, which list files in the directory on the remote machine. The command is between the tic characters '
The output of the ls command goes into the bit bucket (kind of like a black hole for output). The status of the ssh connect and ls (success ( == 0 ) or failure code (== non-zero) ) is stored in the variable $status.
A sort of roundabout way to see if the remote machine is awake on the network, and if the directory exists over there. The options -qno for ssh:
-n used to run in the background when ssh does not read from user's stdin (terminal)
-q quiet mode, stops extra messages
-o (option) turn off strict host key checking. I wonder why...
This User Gave Thanks to jim mcnamara For This Post:
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LEARN ABOUT DEBIAN
bup-on
bup-on(1) General Commands Manual bup-on(1)
NAME
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 <apenwarr@gmail.com>.
Bup unknown- bup-on(1)