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htop is an enhanced version of top, the interactive process viewer,
which can display the list of processes in a tree form.
Comparison between 'htop' and 'top'
* In 'htop' you can scroll the list vertically and horizontally to see
all processes and full command lines.
* In 'top' you are subject to a delay for each unassigned key you press
(especially when multi-key escape sequences are triggered by accident).
* 'htop' starts faster ('top' seems to collect data for a while before
displaying anything).
* In 'htop' you don't need to type the process number to kill a process,
in 'top' you do.
* In 'htop' you don't need to type the process number or the priority
value to renice a process, in 'top' you do.
* In 'htop' you can kill multiple processes at once.
* 'top' is older, hence, more tested.
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