Ubuntu

This page is dedicated to a list of useful command for administrator that use Ubuntu.

Find the UUID of a filesystem

# blkid

How to display free space with colors!

# dfc -Tsi

ls*: a series of list command util

  • lsblk - list block devices
  • lscpu - display information on CPU architecture
  • lshw - list hardware
  • lspci - list all PCI devices


Show a list of all autostart services.

# initctl show-config


Howto list all dependencies of a package

# apt-cache depends package_name

Howto export/import package list


To dump the list of currently installed applications:

# dpkg --get-selections > output-file
To re-import:


# dpkg --set-selections < output-file 
# sudo apt-get dselect-upgrade 
    

Howto remove a package and ignore dependencies


# sudo dpkg -r --force-depends "package"

List processes by mem usage


# ps -e -orss=,args= | sort -b -k1,1n | pr -TW$COLUMNS

How can I find the hardware model in Linux?


# dmidecode | grep -A3 '^System Information'

How to enabling / disabling a service?

To toggle a service from starting or stopping permanently you would need to:
# echo manual | sudo tee /etc/init/SERVICE.override
If you do not want this, afterwards you can simply do:
# rm /etc/init/SERVICE.override

Force a clock update using ntp


# sudo service ntp stop 
# sudo ntpd -gq
# sudo service ntp start
    
or
# ntpdate -u 1.2.3.4
    

Update current timezone


# echo "Europe/Rome" | sudo tee /etc/timezone > /dev/null
# sudo dpkg-reconfigure -f noninteractive tzdata