0x0b Basic System Administration
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0x1) Users and Groups (create,remove,assign to group,important file)
0x2) Premissions (understanding,change symbolically,change numerically)
0x3) Partitions (partitioning,info about partitions,free space,mount,fstab)
0x4) Booting (boot loader,the booting process,run levels)
0x5) Processes Management (list,top,kill,psgrep