POSIX Syntax


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





