shell 脚本 添加cron

addcron.sh

#!/bin/bash


# put old cron to file
crontab -l > tmpcron.txt

s=`crontab -l | grep '/root/dropbox.py start'`
# echo "$s"x
if [[ -z "$s" ]]; then
    echo "00 04 * * * /root/dropbox.py start" >> tmpcron.txt 
fi
s=`crontab -l | grep '/root/dropbox.py stop'`
# echo "$s"x
if [[ -z "$s" ]]; then
    echo "10 04 * * * /root/dropbox.py stop" >> tmpcron.txt 
fi

#install new cron file
crontab tmpcron.txt
rm -f tmpcron.txt