To clean the cache from system which apt caches when we update/install the packages apt-get clean To downloads packages list from repository and update them,to get data on latest available packages apt-get update To install specific version of package apt-get install package-name To check OS version Ex : lsb_release -a To provides the package's description, its dependencies, the name of its maintainer. apt search, apt show, aptitude search, aptitude show work in the similar manner Ex : apt-cache search php5-fpm The checkrestart program tries to determine if there are processes in the system that need to be restarted after a system upgrade .Consequently, checkrestart is sometimes used as an audit tool to find outdated versions of libraries in use, particularly after security upgrades Ex : checkrestart -h ...
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