Question

我想在Scala中运行此命令，尽管我遇到了各种各样的错误：

sed -i '.back' 's/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g' /Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf

或

sed -i '.back' "s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g" /Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf

我在这里列出了所有尝试（无效）。运行此命令的正确方法是什么？

尝试1：

scala> val command = "sed -i '.back' 's/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g' /Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf"
scala> command.! 
sed: 1: "'s/maxTablesPerQuestion ...": invalid command code '
res25: Int = 1

尝试2：双引号：

scala> val command = "sed -i '.back' \"s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g\" /Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf"
scala> command.! 
sed: 1: ""s/maxTablesPerQuestion ...": invalid command code "
res26: Int = 1

尝试3：使用Seq：

scala> val command = Seq("sed -i '.back' \"s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g\" /Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf")
scala> command.! 
java.io.IOException: Cannot run program "sed -i '.back' "s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g" /Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf": error=2, No such file or directory
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  at scala.sys.process.ProcessBuilderImpl$Simple.run(ProcessBuilderImpl.scala:69)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.run(ProcessBuilderImpl.scala:98)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang(ProcessBuilderImpl.scala:112)
  ... 33 elided
Caused by: java.io.IOException: error=2, No such file or directory
  at java.lang.UNIXProcess.forkAndExec(Native Method)
  at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
  at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  ... 36 more

尝试4：使用Seq：

scala> val command = Seq("sed -i '.back' \"s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g\"", "/Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf")

scala> command.!
java.io.IOException: Cannot run program "sed -i '.back' "s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g"": error=2, No such file or directory
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  at scala.sys.process.ProcessBuilderImpl$Simple.run(ProcessBuilderImpl.scala:69)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.run(ProcessBuilderImpl.scala:98)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang(ProcessBuilderImpl.scala:112)
  ... 33 elided
Caused by: java.io.IOException: error=2, No such file or directory
  at java.lang.UNIXProcess.forkAndExec(Native Method)
  at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
  at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  ... 36 more

尝试5：Seq：

scala> val command = Seq("sed -i '.back'", "\"s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g\"", "/Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf")

scala> command.!
java.io.IOException: Cannot run program "sed -i '.back'": error=2, No such file or directory
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  at scala.sys.process.ProcessBuilderImpl$Simple.run(ProcessBuilderImpl.scala:69)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.run(ProcessBuilderImpl.scala:98)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang(ProcessBuilderImpl.scala:112)
  ... 33 elided
Caused by: java.io.IOException: error=2, No such file or directory
  at java.lang.UNIXProcess.forkAndExec(Native Method)
  at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
  at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  ... 36 more

尝试6：

scala> val command = Seq("sed -i", "'.back'", "\"s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g\"", "/Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf")

scala> command.!
java.io.IOException: Cannot run program "sed -i": error=2, No such file or directory
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  at scala.sys.process.ProcessBuilderImpl$Simple.run(ProcessBuilderImpl.scala:69)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.run(ProcessBuilderImpl.scala:98)
  at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang(ProcessBuilderImpl.scala:112)
  ... 33 elided
Caused by: java.io.IOException: error=2, No such file or directory
  at java.lang.UNIXProcess.forkAndExec(Native Method)
  at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
  at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  ... 36 more

尝试7：使用Seq：

scala> val command = Seq("sed", "-i", "'.back'", "\"s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g\"", "/Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf")

scala> command.!
sed: 1: ""s/maxTablesPerQuestion ...": invalid command code "
res34: Int = 1

Answer 1

在Scala中执行系统命令的最佳方法是使用＆＃34; Sequence语法＆＃34; （见代码）。具有转义字符的长字符串更难以正确使用。使用此语法时，我几乎从未遇到任何问题。

需要注意的一点是，您不再需要使用单'或双引号"来定义命令的各个部分。序列已经提供了sed（或任何其他命令）所需的所有详细信息。

尝试一下，如果它没有完全符合你的需要，请告诉我。

import sys.process._

Seq("sed","-i",".back","s/maxTablesPerQuestion/maxTablesPerQuestion = 2.0 /g", "/Users/i-danielk/ideaProjects/aristo/solvers/tableilp/src/main/resources/application.conf").!

在scala中运行控制台命令

1 个答案: