mass_cmd.sh

#!/usr/bin/bash

# usage: ./mass_command <computer(s)> <command>

# path that is per-computer
COMP_PATH='/localdisk/boinc';

#---
# replace ',' with ' ' so that we can easily iterate
computers=`echo $1 | sed -e 's/,/ /g'`

# these are the computer names for my network, for demonstration:
all_majors='tabletop blake macomb cascade phelps colden porter marcy seward nye sawteeth'
all_minors='skylight armstrong cliff gothics hough haystack iroquois colvin panther algonquin wright marshall redfield whiteface'
all_servers='cycle1 cycle2 cycle3'
all_clients="$all_majors $all_minors"
all_computers="$all_servers $all_clients"

# if one of these matches, use that list instead of keyword; switch should have been used here...
if [ "$computers" == "all" ]
then
    computers=$all_computers
fi
if [ "$computers" == 'majors' ]
then
    computers=$all_majors
fi
if [ "$computers" == 'minors' ]
then
    computers=$all_minors
fi
if [ "$computers" == 'clients' ]
then
    computers=$all_clients
fi
if [ "$computers" == 'servers' ]
then
    computers=$all_servers
fi

# remove $1 from $@ -> $args
args=`echo $@ | sed -e "s/$1 //"`

# iterate over $computers and run $args in $COMP_PATH
# NOTE: this makes '.' mean something different in argument to this program vs. when calling this program!
for C in $computers
do
    echo "Running '$args' on $C:"
    ssh $C "cd $COMP_PATH; $args"
done