Plan 9 from Bell Labs’s /usr/web/sources/contrib/rsc/scripts/phoneca
#!/bin/rc tail -1 -f /usr/rsc/call.log | awk 'NR==1{next} NF != 7 {next} $5 == "i-" || $5 == "ip" { s = sprintf("(echo ''\n%s''; tel %s) | upasname=phoneca mail rsc", $0, $NF); system(s); }'