Здравствуйте. Написал небольшой скрипт и в нём присутствует пункт с добавлением команд в cron:
(crontab -l; echo "*/2 * * * * screen -dmS scan_servers bash -c 'cd /var/www && php cron.php 1234 threads scan_servers' */2 * * * * screen -dmS scan_servers bash -c 'cd /var/www && php cron.php 1234 threads scan_servers' */5 * * * * screen -dmS scan_servers_load bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_load' */5 * * * * screen -dmS scan_servers_route bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_route' */1 * * * * screen -dmS scan_servers_down bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_down' */10 * * * * screen -dmS notice_help bash -c 'cd /var/www && php cron.php 1234 notice_help' */15 * * * * screen -dmS scan_servers_stop bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_stop' */15 * * * * screen -dmS scan_servers_copy bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_copy' */30 * * * * screen -dmS notice_server_overdue bash -c 'cd /var/www && php cron.php 1234 notice_server_overdue' */30 * * * * screen -dmS preparing_web_delete bash -c 'cd /var/www && php cron.php 1234 preparing_web_delete' */60 * * * * screen -dmS scan_servers_admins bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_admins' */1 * * * * screen -dmS control_delete bash -c 'cd /var/www && php cron.php 1234 control_delete' */1 * * * * screen -dmS control_install bash -c 'cd /var/www && php cron.php 1234 control_install' */2 * * * * screen -dmS scan_control bash -c 'cd /var/www && php cron.php 1234 scan_control' */2 * * * * screen -dmS control_scan_servers bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers' */5 * * * * screen -dmS control_scan_servers_route bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_route' */1 * * * * screen -dmS control_scan_servers_down bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_down' */60 * * * * screen -dmS control_scan_servers_admins bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_admins' */15 * * * * screen -dmS control_scan_servers_copy bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_copy' */5 * * * * screen -dmS graph_servers_day bash -c 'cd /var/www && php cron.php 1234 threads graph_servers_day' */5 * * * * screen -dmS graph_servers_hour bash -c 'cd /var/www && php cron.php 1234 threads graph_servers_hour'") 2>&1 | grep -v «no crontab» | sort | uniq | crontab — chown root:crontab /var/spool/cron/crontabs/root

А в кроне, присутствует только часть:
*/10 * * * * screen -dmS notice_help bash -c 'cd /var/www && php cron.php 1234 notice_help' */15 * * * * screen -dmS control_scan_servers_copy bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_copy' */15 * * * * screen -dmS scan_servers_copy bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_copy' */15 * * * * screen -dmS scan_servers_stop bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_stop' */1 * * * * screen -dmS control_delete bash -c 'cd /var/www && php cron.php 1234 control_delete' */1 * * * * screen -dmS control_install bash -c 'cd /var/www && php cron.php 1234 control_install' */1 * * * * screen -dmS control_scan_servers_down bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_down' */1 * * * * screen -dmS scan_servers_down bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_down' */2 * * * * screen -dmS control_scan_servers bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers' */2 * * * * screen -dmS scan_control bash -c 'cd /var/www && php cron.php 1234 scan_control' */2 * * * * screen -dmS scan_servers bash -c 'cd /var/www && php cron.php 1234 threads scan_servers' */30 * * * * screen -dmS notice_server_overdue bash -c 'cd /var/www && php cron.php 1234 notice_server_overdue' */30 * * * * screen -dmS preparing_web_delete bash -c 'cd /var/www && php cron.php 1234 preparing_web_delete' */5 * * * * screen -dmS control_scan_servers_route bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_route' */5 * * * * screen -dmS graph_servers_day bash -c 'cd /var/www && php cron.php 1234 threads graph_servers_day' */5 * * * * screen -dmS graph_servers_hour bash -c 'cd /var/www && php cron.php 1234 threads graph_servers_hour' */5 * * * * screen -dmS scan_servers_load bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_load' */5 * * * * screen -dmS scan_servers_route bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_route' */60 * * * * screen -dmS control_scan_servers_admins bash -c 'cd /var/www && php cron.php 1234 control_threads control_scan_servers_admins' */60 * * * * screen -dmS scan_servers_admins bash -c 'cd /var/www && php cron.php 1234 threads scan_servers_admins'

Заметил ещё, что в разном порядке добавились.