How to erase / delete file via SSH server console in Linux?

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A basic knowledge commands will help one to get over some situations while working with servers. A typical scenario is when you work with 1&1 cloud server, where you don't have FTP access.

Change directory / folder : cd directory / folder name
List files and directories: dir
Erase a file: rm file name
Erase a set of files with common file names: rm myFile*.php
Erase a whole directory / folder: rm -rf foldername/
Make a directory / folder: mkdir directory / folder name

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