how to pass a variable to a command in javascript

Question

i want the variable msg to be added to the path like /home/user/map/'msg'. msg is a string type.Anybody knows how? thanks.

socket.on("savemap", function(msg) {

        console.log(msg);

        var cmd ='rosrun map_server map_saver -f /home/user/map/';
        exec(cmd, function(error, stdout, stderr) {

        });
        });

Answer 1

Simply concatenate using + .

var cmd = 'rosrun map_server map_saver -f /home/user/map/' + msg;

Or if you are on ES6 or higher, using string templates :

var cmd = `rosrun map_server map_saver -f /home/user/map/${msg}`;