监视Mongo db的Bash脚本不起作用

Question

while true
do
    ret = $("mongod --config /etc/mongod.conf")
    if $ret == 0
    then
        echo "I am out with code 0."
        break
    fi
    echo "running again"
done
echo "I am out with code $?"

但似乎不起作用。从系统返回：

running again
./mongo-text: line 3: mongod --config /etc/mongod.conf: No such file or directory
./mongo-text: line 3: ret: command not found
./mongo-text: line 4: ==: command not found

不确定是什么问题。任何帮助都很感激。

Answer 1

您的代码中有几个问题：

• $（“mongod--config/etc/mongod.conf”）将尝试将mongod--config/etc/mongod.conf作为命令运行，并包含空格
• 如果语法错误

可以这样重写：

while :; do
    if mongod --config /etc/mongod.conf; then
        echo "I am out with code 0."
        break
    fi
    echo "running again"
    # probably sleep for a few seconds here
done
echo "I am out with code $?"

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