Paul Sutton

CyberSecurity part 9

So on to video 7 of 8, I will maintain the login link so that you don't need to go hunting back through previous posts.

• Bash Basics Part 7 of 8 | System Administration Tools 35 mins

• Bash Basics Part 7 of 8 | System Administration Tools – Invideous 35 mins

Discuss

• Tuxiversity Forum

Summary

• free & free -h
• df & df -h
• du & du | les
• watch – real time monitoring
  • watch free -h – ctrl q to quit
• dmesg – kernel actions, lots of output so...
  • dmesg | tail
• to view the last entries in syslog
  • tail / var/log/syslog
  • tail / var/log/syslog > syslog.txt – redirect to a file
• System d
  • journalctrl – displays messages from boot
• top – display processes etc
• htop – as above but nicer program with more control
• killall – kills a process
• Network
  • video uses ifconfig, which is depreciated so ..
    • ip addr show – will show your ip and network info
• ping – tests a website or computer is up
  • ping www.youtube.com
  • ping ipaddress e.g ping 192.168.2.100
• Mounting file systems
• lsblk – lists block devices
  • sudo mount /dev/sda2 /mnt – mounts a device (note this is the example from the video)
  • sudo umount /dev/sda2 – unmounts a device
• sudo fdisk -l – display info on devices
• UUID
  • sudo blkid – lists devices and uuid info
• uname -a – lists system info e,.g kernel version and architecture
• history – display command history
  • history | less or
  • history 10
• pressing tab after a partly typed command auto completes e.g :
  • his produces
  • history
• cal displays calender
• Disk defrag, as video says this may not be needed, but IS useful if needed
  • sudo ex4defrag /home -c this checks to see if you need to defrag – degrag s only for older hard disks, does not work on solid state devices
• sudo reboot – will reboot the system
• sudo shutdown -r – will reboot
• sudo shutdown -h halts the system
• sudo shutdown -t 20 – sets a 20 minute timer
  • sudo shutdown -c cancels the shutdown timer

Again, all these commands do have a related man page.

Tags

#CyberSecurity,#BASHShell

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