用于检查服务是否在远程主机上运行的Shell脚本

Question

我正在编写一个Shell脚本来检查特定服务在远程主机上是否正在运行。如果未运行，它将运行/etc/init.d/afrender start命令。但不幸的是出现错误

  

意外令牌'then'附近的语法错误

#!/bin/bash
service='afrender'

for host in $(<workstation.txt);
do
echo "------------------workstation:"  $host
sshpass -p 'xxxxx' ssh -o StrictHostKeyChecking=no $host  if " [ $((ps ax | grep -v grep | grep $service)) > /dev/null ] "
then

echo "$service is running"
else  
/etc/init.d/afrender start
fi

done