alx-system_engineering-devops 0x00-shell_basics. 0x01-shell_permissions. 0x02-shell_redirections. 0x03-shell_variables_expansions. 0x04-loops_conditions_and_parsing. 0x05-processes_and_signals. 0x06-regular_expressions. 0x07-networking_basics #0 0x08. Networking basics #1 command_line_for_the_win.