Installing and managing packages is the first thing you do when you use any Linux system. It takes a while to get hang of it on Ubuntu Linux. Here are the the package management commands which I use frequently to manage packages on Ubuntu:
Find latest version of a package
Install (dryrun) memcached using apt-get. Use -s (silent) or --dry-run. This way we can find the latest version available without installing it.
sudo apt-get install --dry-run memcached
Or you can also use apt-cache policy
$ sudo apt-cache policy phantomjs
Install a package on Ubuntu
Install memcached using apt-get
sudo apt-get install memcached
Resynchronize the package index files from their sources
sudo apt-get update
Upgrade the newest versions of all installed packages
sudo apt-get upgrade
Upgrade a specific package
Upgrade php-apc using apt-get
sudo apt-get --only-upgrade install php-apc
Remove a package
Remove memcached using apt-get
sudo apt-get remove memcached
List all packages on your system
sudo dpkg -l
List all files for a package (e.g. apache2)
sudo dpkg -L apache2
File package(s) owning a file (or files)
To list package for /etc/apache2/apache2.conf
dpkg -S /etc/apache2/apache2.conf
Outcome:
apache2.2-common: /etc/apache2/apache2.conf
