The sudo lastb command will list all recently logged in users on your Linux system. This is a useful tool on a server.
jason@eyjafjallajkull:~$ 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 |
The 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.
jason@eyjafjallajkull:~$ 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.
jason@eyjafjallajkull:~$ 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.
jason@eyjafjallajkull:~$ 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.
jason@eyjafjallajkull:~$ printf '%s %s\n' "Hello" $LOGNAME Hello jason |
How to get the temperature of your hard disk drive with the Linux command line.
The hddtemp command will display the temperature of a hard disk drive as long as it has a supported temperature sensor.
jason@eyjafjallajkull:~$ 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.
jason@eyjafjallajkull:~$ 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) |
Nice tips, thanks. Note that you don’t have to pipe the output of du to tail just to get the total size. du has proper arguments for this and you can achieve the same using du -csxh /tmp/ 2>/dev/null
Thanks again.