running system command on windows 8.1

[Mike Shields]

Hi,

 

I’m trying to use Process to run system commands and it doesn’t seem to work. I seem to recall that this worked previously, but I could find my old code. For example to make a directory, in the REPL I do the following:

 

scala> import sys.process._

import sys.process._

 

scala> Process("md tt")!

 

But I get the following warning and nothing happens:

 

warning: there was one feature warning; re-run with -feature for details

java.io.IOException: Cannot run program "md": CreateProcess error=2, The system

cannot find the file specified

  at java.lang.ProcessBuilder.start(Unknown Source)

  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(ProcessBuilderIm

pl.scala:112)

  ... 33 elided

Caused by: java.io.IOException: CreateProcess error=2, The system cannot find th

e file specified

  at java.lang.ProcessImpl.create(Native Method)

  at java.lang.ProcessImpl.<init>(Unknown Source)

  at java.lang.ProcessImpl.start(Unknown Source)

  ... 37 more

 

If I exit the REPL and in the same command prompt do

D:\scala\temp>md tt

 

It works as expected. I recently upgraded to Windows 8.1 and I’m thinking maybe there is some permission for java that is not set correctly.

 

Any ideas?

 

Thanks,

Mike

 

[Daniel Armak]

Are you sure md is a genuine executable and not a Windows shell builtin? Is there an “md.exe” somewhere and is it on your path?

​

Daniel Armak

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[Siddhartha Gadgil]

If I recollect correctly, one has to run "cmd" (the dos command shell) and pass the appropriate command to it (since md is not an executable, but interpreted by the command shell.

Siddhartha

[Daniel Armak]

Alternatively, you could write and run a .bat file. 

Daniel Armak

--

[Mike Shields]

I figured it out. The correct syntax is ot include a /C after the cmd as:

 

scala> Process("cmd /C md \\tt")!

res9: Int = 0

 

Thanks,

Mike