A shell script that can integrate with crontab to keep ss container alive

keepAlive.sh

#!/bin/sh
ssContainer=""
get_ss_container(){
        ssContainer="$(sudo docker container list --all | grep shadowsocks)"
}

# Return 0 if ssContianer is UP
get_ss_status()
{
        isUp="$(echo $ssContainer | grep Up)"
        if [ -n "$isUp" ] ; then
                return 0
        else
                return 1
        fi
}

log(){
        echo "`date -u`: $1" >> /var/log/ss.log
}

restart_ss(){
        containerId=$(echo $ssContainer | awk '{print $1}')
        sudo docker container start $containerId
        log "SS container has been restarted"
}

get_ss_container
get_ss_status
isUp=$?
if [ $isUp -eq 1 ]
then
        restart_ss
fi