Category: Command Line

Check correct syntax and file format of ‘/etc/group’ and groups existence grpck

Delete a user ( ‘-r’ eliminates home directory) userdel -r user1

Set deadline for user password chage -E 2008-12-31 user_name

Change a user’s attributes usermod -c “User FTP” -g system -d /ftp/user1 -s /bin/nologin user1

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