I am new to linux
I want to know about the su command all details
From the command line you can run:
man su
For most commands you will find a man page, also you can find man pages for different topics, if you want to search you can run:
apropos mytopic
it will show you all the man pages that have the string mytopic in the name or description
You can consult Linux manpages for that. To invoke it for a particular command use man <command>
The man man command will provide you with more information on how to browse the documentation.
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