NAME

       mussh - MUltihost SSH

SYNOPSIS

       mussh [ OPTIONS ] <-h host...  | -H hostfile > [-c cmd ] [-C scriptfile ]

DESCRIPTION

       mussh is a shell script that allows you to execute a command or script over ssh(1) on multiple hosts with
       one command. When possible mussh will use ssh-agent(1) and RSA/DSA keys to minimize  the  need  to  enter
       your password more than once.

OPTIONS

       --help Prints full help text.

       -d     Same as -d 1

       -d 0   Turns debug mode off.

       -d 1   On STDERR prints out basic actions and ssh-agent activity and which host is being connected to.

       -d 2   Includes  all of the output from -d1, the list of hosts, the command/script as it will be executed
              on each host, and a lot more.

       -v     Same as -v 1

       -v 1   Sets ssh in debug1 mode by passing "-v" to ssh.

       -v 2   Sets ssh in debug2 mode by passing "-v -v" to ssh.

       -v 3   Sets ssh in debug3 mode by passing "-v -v -v" to ssh.

       -m [n] Run concurrently on 'n' hosts at a time (asynchronous).  Use '0' (zero) for infinite. (default)

       -q     No output unless necessary.  This will cancel -d and -v if after them on  the  command  line.   It
              also  suppresses  the output of each host.  This will NOT suppress the password/passphrase prompts
              required to log into each host.

       -i <identity> [identity ..]
              Load an identity file.  When -i is used, the specified identity file(s) is loaded instead  of  the
              default identity.  You can load as many RSA/DSA identities as you'd like.

       -o <ssh-args>
              Args to pass to ssh with -o option.  See the ssh(1) man page for more info on the -o option.

       -a     Force loading ssh-agent.  Without this flag, mussh will not load another agent when one is already
              loaded.

       -A     Do NOT load ssh-agent.  If no agent is loaded you will be prompted for a password or passphrase by
              ssh  for each host.  If you do not have RSA/DSA keys for the destination hosts, this will save you
              some hassle.

       -b     Print each hosts' output in a block without mingling with other hosts' output.

       -B     Allow hosts' output to mingle. (default)

       -u     Unique.  Eliminate duplicate hosts. (default) If you a host or user@host  occurs  more  than  once
              across  files  specified  with  -H  or hosts specified with -h, the host or user@host is used only
              once.

       -U     Do NOT make host list unique.  This simply overrides the -u flag.  This will cause scripts  to  be
              executed on duplicate hosts once per listing.

       -P     Do NOT fall back to passwords on any host.  This will skip hosts where keys fail.  If you use this
              with '-d' you'll still see which hosts failed.

       -l <login>
              Use 'login' when no other is specified with hostname.

       -L <login>
              Force use of 'login' name on all hosts.  These can be handy for adding 'root@' to  hostnames  kept
              in a file for -H option.  With -h it means you get to type less.

       -s <shell>
              Path to shell on remote host. (Default: bash)

       -t <secs>
              Timeout setting for each session.  (requires openssh 3.8 or newer)

       -V     Print version info and exit.

PROXY ARGS

       -p [user@]<host>
              Host to use as proxy.  (Must have mussh installed)

       -po <ssh-args>
              Args to pass to ssh on proxy with -o option.

HOST ARGS

       -h [user@]<host> [[user@]<host> ..]
              Add a host to list of hosts.  May be used more than once.

       -H <file> [file ..]
              Add  contents  of  file(s)  to  list  of hosts.  Files should have one host per line.  Use "#" for
              comments.

COMMAND ARGS

       If neither is specified, commands will be read from standard input.

       -c <command>
              Add a command or quoted list of commands and args to list of commands to be executed on each host.
              May be used more than once.

       -C <file> [file ..]
              Add file contents to list of commands to be executed on each host.  May be used more than once.

PROXY MODE

       When proxying, mussh can use a single remote server to as a bastion host.  All hosts will be connected to
       from the central host rather than from the computer where you are initially running mussh.  This  can  be
       handy when you only have access to one machine behind a firewall.

       The  proxy  host  must  have  OpenSSH 2.3 or greater, or an sshd that works with ForwardAgent under ssh2.
       Proxy server must also have mussh installed in your PATH.  To verify that it is in  your  path  use  "ssh
       user@proxy 'which mussh'".  Use "ssh user@proxy 'echo $PATH'" to determine what your path is.

SSH-AGENT INTERACTION

       Assuming  that  you're  not  turning  off  the  agent  with  '-A' mussh will attempt to use ssh-agent(1).
       Normally mussh will get rid of the agent when it exits.  See EXAMPLES for examples.

EXAMPLES

       There is an EXAMPLES file with detailed examples.

       The basic command:
              $ mussh -h foo bar baz

       A simple command:
              $ mussh -h foo bar baz -c 'rpm -e emacs'

       A simple command asynchronously:
              $ mussh -h foo bar baz -c 'rpm -e emacs' -m

       Using a specific key:
              $ mussh -h foo bar baz -c 'rpm -e emacs' -i ~/.ssh/my_other.key

       Loading a list of hosts from a file:
              $ mussh -H /tmp/hostlist.txt -c 'rpm -e emacs'

       Loading a script from a file:
              $ mussh -h foo bar baz -C /tmp/scriptfile.sh

BUGS

       Please report any bugs at http://sourceforge.net/projects/mussh/

AUTHOR

       Dave Fogarty <doughnut at doughnut dot net>

SEE ALSO

       ssh(1), ssh-agent(1)