arriqaaq/commands.md

## commands.md

      
        

            Raw
  

        
        
          
            
          
          
            
              commands.md
            
          
        
      
      
    Commands
Pseudo file systems
The command ‘uname‘ displays the information about the system.
Syntax:
uname [OPTION]
Options and Examples

-a option: It prints all the system information in the following order: Kernel name, network node hostname, kernel release date, kernel version, machine hardware name, hardware platform, operating system
.
Syntax:

$ uname  -a
2. -s option: It prints the kernel name.
Syntax:
$ uname  -s

-r option: It prints the kernel release date.

Syntax:
$ uname  -r

-m option: It prints the machine hardware name.

Syntax:
$ uname  -m
Kernel Modules
The modules are loaded on demand by udev (device manager). You can also manually load a module into the kernel using the modprobe command, or automatically at boot time.

lsmod and modinfo: List and show details of kernel modules.
modprobe: Dynamically load and unload kernel modules.

Hardware
/dev contains information on all connected hardware of a system.

lshw, lscpu, lspci, lsusb, dmidecode: hardware information, including CPU, BIOS, RAID, graphics, devices, etc.
lsblk: list block devices: a tree view of your disks and disk partitions

Linux Boot System

dmesg: boot and system error messages
Use dmesg whenever something's acting really funny (it could be hardware or driver issues).
journalctl -k: systemd utility to view the kernel ring buffer within the systemd journal.