Scala cmd 執行命令
阿新 • • 發佈：2018-12-09
scala> import sys.process._ import sys.process._ scala> "ls -al".! 總用量 24 drwxrwxr-x 6 1001 1001 4096 3月 4 2016 . drwxr-xr-x 4 root root 4096 9月 13 15:53 .. drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man res0: Int = 0
scala> val exitCode = "ls -al".!
總用量 24
drwxrwxr-x 6 1001 1001 4096 3月 4 2016 .
drwxr-xr-x 4 root root 4096 9月 13 15:53 ..
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin
drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib
drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man
exitCode: Int = 0
scala> :paste // Entering paste mode (ctrl-D to finish) def listFile: Int ={ val cmd = "ls -al" val exitCode = cmd.! exitCode } // Exiting paste mode, now interpreting. listFile: Int scala> listFile 總用量 24 drwxrwxr-x 6 1001 1001 4096 3月 4 2016 . drwxr-xr-x 4 root root 4096 9月 13 15:53 .. drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man res1: Int = 0
scala> Seq("ls","-al").!
總用量 24
drwxrwxr-x 6 1001 1001 4096 3月 4 2016 .
drwxr-xr-x 4 root root 4096 9月 13 15:53 ..
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin
drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib
drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man
res2: Int = 0
scala> Process("ls -al").! 總用量 24 drwxrwxr-x 6 1001 1001 4096 3月 4 2016 . drwxr-xr-x 4 root root 4096 9月 13 15:53 .. drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man res3: Int = 0
scala> val files = Process("find / -print").lines
warning: there was one deprecation warning; re-run with -deprecation for details
files: Stream[String] = Stream(/, ?)
scala> Exception in thread "Thread-17" java.lang.OutOfMemoryError: GC overhead limit exceeded
at scala.util.Right$.apply(Either.scala:201)
at scala.sys.process.BasicIO$Streamed$$anonfun$apply$2.apply(BasicIO.scala:52)
at scala.sys.process.BasicIO$Streamed$$anonfun$apply$2.apply(BasicIO.scala:52)
at scala.sys.process.BasicIO$.readFully$1(BasicIO.scala:184)
at scala.sys.process.BasicIO$.processLinesFully(BasicIO.scala:188)
at scala.sys.process.BasicIO$$anonfun$processFully$1.apply(BasicIO.scala:165)
at scala.sys.process.BasicIO$$anonfun$processFully$1.apply(BasicIO.scala:163)
at scala.sys.process.ProcessBuilderImpl$Simple$$anonfun$3.apply$mcV$sp(ProcessBuilderImpl.scala:74)
at scala.sys.process.ProcessImpl$Spawn$$anon$1.run(ProcessImpl.scala:23)
由於 根目錄下 / 檔案太多，導致 出現了 gc 。
scala> import sys.process._
import sys.process._
scala> val result = "ls -al" !!
warning: there was one feature warning; re-run with -feature for details
result: String =
"總用量 24
drwxrwxr-x 6 1001 1001 4096 3月 4 2016 .
drwxr-xr-x 4 root root 4096 9月 13 15:53 ..
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin
drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib
drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man
"
scala> println(result)
總用量 24
drwxrwxr-x 6 1001 1001 4096 3月 4 2016 .
drwxr-xr-x 4 root root 4096 9月 13 15:53 ..
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 bin
drwxrwxr-x 4 1001 1001 4096 3月 4 2016 doc
drwxrwxr-x 2 1001 1001 4096 3月 4 2016 lib
drwxrwxr-x 3 1001 1001 4096 3月 4 2016 man