cheat-fork-echo/cheat/cheatsheets/apt-get

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# Desc: Allows to update the operating system
# To fetch package list
apt-get update
# To download and install updates without installing new package.
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apt-get upgrade
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# To download and install the updates AND install new necessary packages
apt-get dist-upgrade
# Full command:
apt-get update && apt-get dist-upgrade
# To install a new package(s)
apt-get install package(s)
# Download a package without installing it. (The package will be downloaded in your current working dir)
apt-get download modsecurity-crs
# Change Cache dir and archive dir (where .deb are stored).
apt-get -o Dir::Cache="/path/to/destination/dir/" -o Dir::Cache::archives="./" install ...
# Show apt-get installed packages.
grep 'install ' /var/log/dpkg.log
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# Silently keep old configuration during batch updates
apt-get update -o DPkg::Options::='--force-confold' ...