• advanced client selection (you can use + and - to add/remove hosts/groups)
• tab completion
• persistent history
• a command sub-shell
• quick help (just hit the "?" key)

funcshell took a similar approach to features as Func; it allows developers to easily extend and customize its functionality using a plugin system. It also assumes the most useful commands will be the ones you write yourself. That being said, funcshell currently comes with both the command and service module.

Here are some things you can do with funcshell.

Get a list of all clients (not very useful if you have hundreds):

funcshell> set clients *
funcshell> get clients
webapp001.example.net
webapp002.example.net
webapp003.example.net
webstatic001.example.net
webstatic002.example.net

Assuming webapp00[1-3].example.net are in the app and bpstatic00[1-2].example.net1 are in the static groups; remove some clients and restart a service:

funcshell> set clients - @static;webapp001*
funcshell> get clients
webapp002.example.net
webapp003.example.net
funcshell> service httpd restart
==> webapp003.example.net <==
True
==> webapp002.example.net <==
True

Run a command and get the results:

funcshell> set clients - webapp003*
funcshell> set clients + webstatic002*
funcshell> command run grep MemTotal /proc/meminfo | awk '{ print $2/1024 }'
==> webstatic002.example.net :: 0 <==
4099.44
==> webapp002.example.net :: 0 <==
8198.88

Get help:

funcshell> command <TAB><TAB>
exists   run      shell
funcshell> command ?
  exists Check if a command exists
  run    Run a command
  shell  Run a command shell

Run a couple of commands in a row:

funcshell> set c<TAB> @static
funcshell> command shell
> du -sh /tmp
==> webstatic002.example.net :: 0 <==
7.2M    /tmp
==> webstatic001.example.net :: 0 <==
3.4M    /tmp
> cp -r /tmp /tmp
==> webstatic002.example.net :: 1 <==
cp: cannot copy a directory, '/tmp', into itself, '/tmp/tmp'
==> webstatic001.example.net :: 1 <==
cp: cannot copy a directory, '/tmp', into itself, '/tmp/tmp'
> asdf
==> webstatic002.example.net :: 127 <==
/bin/sh: asdf: command not found
==> webstatic001.example.net :: 127 <==
/bin/sh: asdf: command not found
> <CTRL-D>
funcshell> exit

funcshell is a shell interface to Func which provides some useful features for managing a large number of machines.