sudo lastb command will list all recently logged in users on your Linux system. This is a useful tool on a server.
[email protected]:~$ sudo lastb jason :0 :0 Thu Jan 8 12:41 - 12:41 (00:00) jason :0 :0 Mon Jan 5 11:42 - 11:42 (00:00) jason :0 :0 Mon Jan 5 11:42 - 11:42 (00:00) btmp begins Mon Jan 5 11:42:03 2015
lastlog command will list all of the users on your system, and will show the last login time if they have logged in before.
List free space on the / partition. Use the
df -Hla / command to show the available space on the partition.
[email protected]:~$ df -Hla / Filesystem Size Used Avail Use% Mounted on /dev/sdb3 235G 76G 160G 33% /
How to list just the space taken up by a directory and it`s contents. Use the
du -ackh DIRNAME | tail -n 1 command.
[email protected]:~$ du -ackh Desktop/ | tail -n 1 118M total
This will show the amount of space that the directory contents take up on the disk.
How to list all installed CPU`s in your Linux machine. Use the
lscpu command to list all hardware CPU`s installed in your Linux machine.
[email protected]:~$ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 2 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 37 Model name: Intel(R) Core(TM) i3 CPU 530 @ 2.93GHz Stepping: 2 CPU MHz: 1197.000 CPU max MHz: 2926.0000 CPU min MHz: 1197.0000 BogoMIPS: 5866.27 Virtualisation: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 4096K NUMA node0 CPU(s): 0-3
Use printf in bash.
[email protected]:~$ printf '%s %s\n' "Hello" $LOGNAME Hello jason
How to get the temperature of your hard disk drive with the Linux command line.
The hddtemp command will display the temperature of a hard disk drive as long as it has a supported temperature sensor.
[email protected]:~$ sudo hddtemp /dev/sdb /dev/sdb: ST3500418AS: 33°C
Also use the sensors command to read the temperatures of your hardware with the Linux command line. This is how to view the temperature of your video card under Linux.
[email protected]:~$ sensors coretemp-isa-0000 Adapter: ISA adapter Core 0: +47.0°C (high = +89.0°C, crit = +105.0°C) Core 2: +45.0°C (high = +89.0°C, crit = +105.0°C) radeon-pci-0100 Adapter: PCI adapter temp1: +35.5°C (crit = +120.0°C, hyst = +90.0°C)