Kali Basics

How to change the root password
root@bt:~# passwd Enter new UNIX password: {enter
your new password here}
Retype new UNIX password: {enter your new password
again}
passwd: password updated successfully
root@bt:~#
How to start services
root@bt:~# /etc/init.d/openvpn start
Starting Virtual private network daemon(s)…
root@bt:~# /etc/init.d/openvpn stop

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How to check kernel version
Use the uname -a as show below

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Common Apt Commands
apt-get install <package> Downloads <package> and
all of its dependencies, and installs or upgrades them.
apt-get remove [–purge] <package> Removes
<package> and any packages that depend on it. –purge
specifies that packages should be purged.
apt-get update Updates packages listings from the
repo, should be run at least once a week.
apt-get upgrade Upgrades all currently installed
packages with those updates available from the repo.
should be run once a week.
apt-get dist-upgrade [-u] Similar to apt-get upgrade,
except that dist-upgrade will install or remove
packages to satisfy dependencies.
apt-cache search <pattern> Searches packages and
descriptions for <pattern>.
apt-cache show <package> Shows the full description
of <package>.
apt-cache showpkg <package> Shows a lot more detail
about <package>, and its relationships to other
packages.
man apt Will give you more info on these commands
as well as many that are in less common usage.

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Common dpkg commands
dpkg -i <package.deb> Installs a package file; one that
you downloaded manually, for example.
dpkg -c <package.deb> Lists the contents of
<package.deb> a .deb file.
dpkg -I <package.deb> Extracts package information
from <package.deb> a .deb file.
dpkg -r <package> Removes an installed package
named <package>
dpkg -P <package> Purges an installed package named
<package>. The difference between remove and purge
is that while remove only deletes data and executables,
purge also deletes all configuration files in addition.
dpkg -L <package> Gives a listing of all the files
installed by <package>. See also dpkg -c for checking the contents of a .deb file.
dpkg -s <package> Shows information on the installed
package <package>. See also apt-cache show for
viewing package information in the Debian archive
and dpkg -I for viewing package information extracted
from a .deb file.
dpkg-reconfigure <package> Reconfigures an
installed package
man dpkg Will give you more info on these commands
as well as many that are in less common usage.