【scala】scala安装测试

下载安装scala：
scala-2.13.1.tgz

解压：

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

查看目录：

[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

启动并测试Scala：

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