Multiples commands in one line

[Fernando Cappi]

Hi,

How can i join two or more commands in one line, on the mongo shell?

Example: rs.initiate();rs.add("host:port")

Thanks,

Fernando

[Asya Kamsky]

Just like that.   Semicolon will separate two commands.  They will be run in order that you enter them in.

[Fernando Cappi]

The following doesn't work:

rs0:PRIMARY> show dbs; show dbs;
Sat May  4 21:49:04.707 JavaScript execution failed: don't know how to show [dbs;] at src/mongo/shell/utils.js:L847

[Jorge Puente Sarrín]

Hi Fernando,

show dbs is a simple helper:

https://github.com/mongodb/mongo/blob/master/src/mongo/shell/utils.js#L780-L801

You should to use: db.getMongo().getDBs();

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[Asya Kamsky]

You need a space after dbs like this:

  >  show dbs ; show dbs

On regular commands (as opposed to helpers) you won't need it.

What exactly are you trying to do that can't be done on multiple lines?

Asya

[Fernando Cappi]

i'm trying to initializate replicaset and add 2 members to it:

mongo --eval "rs.initiate();rs.add('host1:port1');rs.add('host2:port2')"

The problem is that only the first command (rs.initiate()) is executed

[Asya Kamsky]

Are you sure about this?   It would be better if you explicitly print out the returned status of each command (it's returned as json so you have to use printjson rather than print.

$ mongo --quiet --eval "printjson(rs.initiate());printjson(rs.add('host1:port1'));printjson(rs.add('host2:port2'))"

{ "ok" : 0, "errmsg" : "server is not running with --replSet" }

{ "ok" : 0, "errmsg" : "not running with --replSet" }

{ "ok" : 0, "errmsg" : "not running with --replSet" }

Obviously I got errors from all because I'm not running the mongod I sent these to with replSet option :)

Rather than sending all the commands as a single line to eval why not put them into a script file (.js file)?

initRepl.js

var statusInit = rs.initiate();

var statusAdd1 = rs.add('host1:port1');

var statusAdd2 = rs.add('host2:port2');

if (statusInit.ok==0 || statusAdd1.ok==0 || statusAdd2.ok==0) {

   print("Not everything was okay! \n" + tojson(statusInit) + "\n" + tojson(statusAdd1) + "\n" + tojson(statusAdd2));

}

Now run this with 

$ mongo --quiet initRepl.js

Not everything was okay!

{ "ok" : 0, "errmsg" : "server is not running with --replSet" }

{ "ok" : 0, "errmsg" : "not running with --replSet" }

{ "ok" : 0, "errmsg" : "not running with --replSet" }

$ 

Makes it a lot more manageable and you can add a lot more functionality and error checking, etc.  Plus it's in a file so you can rerun it in the future whereas command history may disappear.

Asya

[Fernando Cappi]

Thanks Asya, it works!! I will use the .js file

Fernando