we do send exact meaning to computer by CLI following POSIX syntax (unix, maxos) and linux is similar. windows and android do not follow this so we need emulator(translator) - like git or cygwin
Function key
- ^C - cancel this command
- tab - auto complete
- ; - add another command
- - means abbreviation — means full name
posix system consider file as hidden when file name start from . can see by ls -a(.) or ls -A(also ..) and used by ls -la or -al(plus long format) .. is previous directory
man(manual) ls == ls —help // man can exit by q