DOS配合FastCopy实现远程增量备份

1.

Interactive Ruby—is the tool of choice
for executing Ruby interactively. irb is a Ruby shell, complete with
command-line history, line-editing capabilities, and job control. Exit an irb
session by typing exit or by using the end-of-file character on your operating
system (normally Ctrl+D or Ctrl+Z).

2. 

On Unix systems, you can use the
“shebang” notation as the first line of the program file: #!/usr/bin/ruby

3. 

A shebang (also called a hashbang) is
the character sequence consisting of the characters number sign and exclamation
point (#!), when it occurs as the first two characters on the first line of a
text file. In this case, the program loader in Unix-like operating systems
parses the rest of the first line as an interpreter directive and invokes the
program specified after the character sequence with any command line options
specified as parameters. The name of the file being executed is passed as the
final argument.

4. 

If a source file is documented using
RDoc, its documentation can be extracted and converted into HTML and ri
formats.

5. 

To find the documentation for a class,
type ri
ClassName

. To get a list of classes with ri documentation, type ri

with no arguments.

6.

Once you find a set of options you
like, you can set them into the RI environment variable. Using our shell, this
would be done using the following:

$ export RI="--format ansi --width 70"