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Some useful general variables in Exim

A complete list of the available variables is given in the Exim documentation. This shortened list contains the ones that are most likely to be useful in personal filter files: $body_linecount: The number of lines in the body of the message… [ + ]

VIM: file editor command line on Linux

VIM is a free text editor, open-source in Unix-like/Linux command line. The main purpose of an editor is to create, add, or modify text for a file. Open file Syntax vi [tùy_chọn] [filename] Adding, Changing, and Deleting Text Note: You… [ + ]

ls command list files and directories in Linux

ls command is a basic Linux shell command used to list files and directories. ls command comes with so many arguments and features like: sort files and directories by Date, by Size, able to check hidden files and directories, permissions,… [ + ]