====== apt-cache ======
<code bash>
apt-cache search "kernel"
apt-cache search -n "kernel"

apt-cache pkgnames "kernel"
apt-cache show bash

apt-cache depends bash
apt-cache rdepends bash
</code>

====== apt ======

<code bash>
apt clean
apt list --updatable
apt list tzdata
apt update
apt upgrade
apt -u upgrade
apt dist-upgrade

apt search apache
apt install apache2-dev
apt remove apache2-dev
apt purge apache2-dev

</code>

====== dpkg ======


<code bash>
dpkg -S /etc/logrotate.conf
dpkg -L tzdata 
dpkg -l tzdata
dpkg -s tzdata 
dpkg-reconfigure apache2 
dpkg --get-selections "*kernel*"
</code>