lsns

$ lsns
        NS TYPE   NPROCS PID USER COMMAND
4026531835 cgroup      2   1 root bash
4026531837 user        2   1 root bash
4026532666 mnt         2   1 root bash
4026532667 uts         2   1 root bash
4026532668 ipc         2   1 root bash
4026532669 pid         2   1 root bash
4026532671 net         2   1 root bash