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## yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

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## yum install htop -y

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## 查看htop版本信息
[meizhaohui@localhost ~]$ htop --version
htop 2.2.0 - (C) 2004-2019 Hisham Muhammad
Released under the GNU GPL.

## 查看htop帮助信息
[meizhaohui@localhost ~]$ htop --help
htop 2.2.0 - (C) 2004-2019 Hisham Muhammad
Released under the GNU GPL.

-C --no-color               Use a monochrome color scheme
-d --delay=DELAY            Set the delay between updates, in tenths of seconds
-h --help                   Print this help screen
-s --sort-key=COLUMN        Sort by COLUMN (try --sort-key=help for a list)
-t --tree                   Show the tree view by default
-u --user=USERNAME          Show only processes of a given user
-p --pid=PID,[,PID,PID...]  Show only the given PIDs
-v --version                Print version info

Long options may be passed with a single dash.

Press F1 inside htop for online help.
See 'man htop' for more information.
[meizhaohui@localhost ~]$