Hack to run bi-weekly jobs via Cron

cron-hack

# Hack to run every 2nd Tuesday:
#  - Cron notation to run every Tuesday
#  - PHP exits with (effectively): date("W") % 2
#     - Hacked to remove all '%' because cron can't handle them
#  - Use shell chaining (&& and ||) to determine even/odd weeks
#     - && for even week numbers, || for odd
# So to run `echo "Still here ..."` every other Tuesday at 10:30 AM:
30 10 * * 2 php -r 'exit((int)fmod(date("W"),2));' && echo "Still here ..."

# Note: PHP can obviously be replaced with anything that
# can be executed in a similar fasion and doesn't contain
# percentage signs (%), e.g. Ruby:
#   `ruby -rdate -e 'exit (Date.today.cweek.modulo(2))'`