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Test disk I/O
Especially useful to gauge the performance of a VPS.

Prevent shell autologout
Unset TMOUT or set it to 0 in order to prevent shell autologout. TMOUT is the number of seconds after which the present shell will be killed if it has been idle for that long.

Create a random file of a specific size
This will create a 10 MB file named testfile.txt. Change the count parameter to change the size of the file. As one commenter pointed out, yes /dev/random can be used, but the content doesn't matter if you just need a file of a specific size for testing purposes, which is why I used /dev/zero. The file size is what matters, not the content. It's 10 MB either way. "Random" just referred to "any file - content not specific"

Display the tree of all instance of a particular process

Display top 5 processes consuming CPU

See your current RAM frequency

lsof - cleaned up for just open listening ports, the process, and the owner of the process
another formatting/oneliner for lsof User - Process - Port

Convert all files for iPhone with HandbrakeCLI

Command to logout all the users in one command
It's only to logout all other user's except "root"

Detect illegal access to kernel space, potentially useful for Meltdown detection
Based on capsule8 agent examples, not rigorously tested


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