Switched On Tech Design

Tag: linux

  • How to find the user id – uid – for a user in Linux

     

    This one is straight-forward for CentOS, Ubuntu and others distros:

     

    id -u [username]

     

    e.g.

     

    id -u bob

     

    That will give a numeric result like 500 or 1001.

  • How to find number of cores in Ubuntu (or other versions of Linux)?

     

    If you’re using a virtual server (whether online or your own physical machine) it can be handy sometimes to check how many CPU cores are available; here are two easy methods of doing this. The first:

     

    nproc

     

    This will return a single number, whether it be 1, 2, 4 or otherwise. For a more detailed look, try:

     

    lscpu

     

    This will usually give a more complex readout, e.g.:

     

    root@server [/]# lscpu
    Architecture:          x86_64
    CPU op-mode(s):        32-bit, 64-bit
    Byte Order:            Little Endian
    CPU(s):                1
    On-line CPU(s) list:   0
    Thread(s) per core:    1
    Core(s) per socket:    1
    CPU socket(s):         1
    NUMA node(s):          1
    Vendor ID:             GenuineIntel
    CPU family:            6
    Model:                 45
    Stepping:              7
    CPU MHz:               2000.024
    BogoMIPS:              4000.04
    Hypervisor vendor:     Xen
    Virtualization type:   para
    L1d cache:             32K
    L1i cache:             32K
    L2 cache:              256K
    L3 cache:              15360K
    NUMA node0 CPU(s):     0