A Perl oneliner (with a shell alias) that calculates the average running pace based on distance and time.

pace.sh

# A Perl oneliner (with a shell alias) that calculates the average running pace based on distance and time
# Examples:
#   pace 5 28:05          # 5 kilometres, 28 minutes and 5 seconds
#   pace 10.5 45:28       # 10.5 kilometres, 45 minutes and 28 seconds
#   pace 42.195 2:03:38   # Marathon, 2 hours, 3 minutes and 38 seconds (current WR)
alias pace="perl -e 'map{\$t+=\$_*60**\$i++}reverse split/:/,pop;\$t/=pop;printf\"%d:%02d\n\",\$t/60,\$t%60'"