The document lists several dangerous commands that can be run on a Linux or Unix system and cause data loss or system instability. It also provides basic commands for file operations, package management, networking tasks and changing permissions and passwords. The dangerous commands include deleting all files in the root folder, formatting a partition, executing a fork bomb to overload the system, and overwriting the file system on a designated device. The basic commands cover file listing, copying, downloading, creating directories and viewing directory information. It also explains Linux file permissions in terms of read, write and execute attributes.

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2. BasicUbuntu CommandLine

9. Linux Permission # chattr +i filename Unlock: # chattr i namafile Chattr

10. Change Password Windows > Install chntp : $ sudo apt-get install chntp > Mount your “Windows installed” device $ sudo mount /dev/sda1 /media/WINDOWS > Goto your Windows system configuration folder $ cd /media/WINDOWS/WINDOWS/system32/config/ Cracking the SAM file : $ chntpw SAM