# Script to enforce a 10 minute break every half hour from typing -
# Written for someone (Uwe Hollerbach) with Carpal Tunnel Syndrome.
# If you type for more than 20 minutes straight, the script rings
# the bell after every character until you take a 10 minute break.
# Author: Don Libes, NIST
# Date: Feb 26, '95
spawn $env(SHELL)
set start [clock seconds] ;# when we started our current typing period
set stop [clock seconds] ;# when we stopped typing
set typing 1200 ;# twenty minutes, max typing time allowed
set notyping 600 ;# ten minutes, min notyping time required
interact -nobuffer -re . {
set now [clock seconds]
if {$now-$stop > $notyping} {
set start [clock seconds]
} elseif {$now-$start > $typing} {
send_user "\007"
}
set stop [clock seconds]
}