da script a php

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i have create this simple script i bash that modify the crontab's
user's file with an option passed by standard input, now i would know
if is possible create a similar script with php so i can choose with
radiobutton or check box, the frequency of the command in crontabs
In case of option=1 the cmd is executed every 10 minutes
in case of option=2 every 20 minutes
an so far

this is an extract of script
empty_crontab () {
echo "----------------------------------------------"
/etc/init.d/cron stop
cat /dev/null > /var/spool/cron/crontabs/alessandro

cron_restart () {
sleep 2
/etc/init.d/cron restart
case $option in

#option prende da 1 a n se è 1 */10 minuti, se è 2 */20 e cosi via
    echo "*/10 * * * * sudo pon cartellinator"  > /var/spool/cron/
    echo "Connessione al server di posta ogni 10 minuti"

PS: is exists a command to write a file without echo line1 >>file,
echo line2>>file etc.?

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