方法1，利用flock

flock -xn /tmp/ktsee.lock -c 'sh /root/ktsee.sh'
方法2，脚本实现
#!/bin/sh
# check lock exist
if [[ -f /tmp/ktsee.lock ]]
then
    echo ktsee is running
    exit 1
else
    touch /tmp/ktsee.lock
fi
# ===Start shell script content===
echo 'Visit http://3sv.ktsee.com'
# ===End shell script content===
# remove the lock
rm -f /tmp/ktsee.lock