Hello,
The first link pointed to by Google when you search 'difference between apt-get update and upgrade' gives you this site:
http://www.linuxnix.com/2011/02/diff...-commands.html
You could also have looked at the man page for apt-get which would have given you:
Quote:
update
update is used to resynchronize the package index files from their sources. The indexes of available packages are fetched from the location(s)
specified in /etc/apt/sources.list. For example, when using a Debian archive, this command retrieves and scans the Packages.gz files, so that
information about new and updated packages is available. An update should always be performed before an upgrade or dist-upgrade. Please be aware that
the overall progress meter will be incorrect as the size of the package files cannot be known in advance.
upgrade
upgrade is used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sources.list.
Packages currently installed with new versions available are retrieved and upgraded; under no circumstances are currently installed packages removed,
or packages not already installed retrieved and installed. New versions of currently installed packages that cannot be upgraded without changing the
install status of another package will be left at their current version. An update must be performed first so that apt-get knows that new versions of
packages are available.
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I doubt you've searched with an appropriate search term.
Kind regards,
Eric
