special symbols

. : current directory
- cp f1 ./f2 -- copy f1 to f2 in the current directory
.. : parent directory
- cp f1 ../f2 -- copy f1 to f2 in the parent directory
> : standard output redirection
- cat f1 > f3 -- display the content of f1 in f3 (same effect as “cp f1 f3”)
| : pipe. redirect the standard output of the first program into the standard input of the second program
- cat f1 | more
* : match any file name
- ls b* -- diplay all file/directory names that start with ‘b’