mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool.
[Read More]bmon - bandwidth monitor and rate estimator
bmon is a monitoring and debugging tool to capture networking related statistics and prepare them visually in a human friendly way.
[Read More]ncdu - NCurses Disk Usage
ncdu (NCurses Disk Usage) is a curses-based version of the well-known du, and provides a fast way to see what directories are using your disk space.
tldr - a supplement to man
Excerpt from tldr.sh: The tldr pages are a community effort to simplify the beloved man pages with practical examples.
Get more information at tldr-pages at GitHub.
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