MongoDB获取命令行启动参数的方法; 有时候希望知道启动mongd的启动参数，可以使用如下命令获得：
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use admin
db.runCommand("getCmdLineOpts")
例如
> use admin
switched to db admin
> db.runCommand("getCmdLineOpts")
{
"argv" : [
"/usr/local/opt/mongodb/bin/mongod",
"--config",
"/usr/local/etc/mongod.conf"
],
"parsed" : {
"config" : "/usr/local/etc/mongod.conf",
"net" : {
"bindIp" : "127.0.0.1"
},
"storage" : {
"dbPath" : "/usr/local/var/mongodb"
},
"systemLog" : {
"destination" : "file",
"logAppend" : true,
"path" : "/usr/local/var/log/mongodb/mongo.log"
}
},
"ok" : 1
