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Create a new user belongs “admin” group called ‘user1’ useradd -c “Name Surname ” -g admin -d /home/user1 -s /bin/bash…

Show space used by deb packages installed sorted by size (ubuntu, debian and like) dpkg-query -W -f='{Installed-Size;10}t{Package}n’ | sort -k1,1n

Rename a group groupmod -n new_group_name old_group_name

Set date and time – MonthDayhoursMinutesYear.Seconds date 041217002007.00

Show the calendar of 2008 cal 2008

Show interrupts cat /proc/interrupts

Remove a given folder from a Git repository… git rm -r cache/

show file(s) swap cat /proc/swaps

This command removes the SVN data from a folder. find -name .svn -exec rm -rf {} \;

Show configuration of an ethernet network card ifconfig eth0