[hadoop@hadoop01 ~]$ tar -zxvf scala-2.13.1.tgz

[hadoop@hadoop01 scala-2.13.1]$ ls -ll

total 16

drwxrwxr-x. 2 hadoop hadoop   162 Sep 18 17:23 bin

drwxrwxr-x. 4 hadoop hadoop    86 Sep 18 17:23 doc

drwxrwxr-x. 2 hadoop hadoop   153 Sep 18 17:23 lib

-rw-rw-r--. 1 hadoop hadoop 11357 Sep 18 17:23 LICENSE

drwxrwxr-x. 3 hadoop hadoop    18 Sep 18 17:23 man

-rw-rw-r--. 1 hadoop hadoop   646 Sep 18 17:23 NOTICE

scala> println("hello world")

hello world

scala> 5*9

res1: Int = 45

scala> 2*res1

res4: Int = 90

scala> :help   //这里显示了scala命令的使用方法，注意命令前不要少了:

All commands can be abbreviated, e.g., :he instead of :help.

:completions <string>    output completions for the given string

:edit <id>|<line>        edit history

:help [command]          print this summary or command-specific help

:history [num]           show the history (optional num is commands to show)

:h? <string>             search the history

:imports [name name ...] show import history, identifying sources of names

:implicits [-v]          show the implicits in scope

:javap <path|class>      disassemble a file or class name

:line <id>|<line>        place line(s) at the end of history

:load <path>             interpret lines in a file

:paste [-raw] [path]     enter paste mode or paste a file

:power                   enable power user mode

:quit                    exit the interpreter

:replay [options]        reset the repl and replay all previous commands

:require <path>          add a jar to the classpath

:reset [options]         reset the repl to its initial state, forgetting all session entries

:save <path>             save replayable session to a file

:sh <command line>       run a shell command (result is implicitly => List[String])

:settings <options>      update compiler options, if possible; see reset

:silent                  disable/enable automatic printing of results

:type [-v] <expr>        display the type of an expression without evaluating it

:kind [-v] <type>        display the kind of a type. see also :help kind

:warnings                show the suppressed warnings from the most recent line which had any

scala> :quit