Java Runtime.getRuntime().exec("ipconfig/release"); returns error?

Question

I want to disconnect my computer from the internet, and the best way that I can think of, is running the ipconfig/release from the cmd. To do so, I did

 Process result = Runtime.getRuntime().exec("ipconfig/release");

This throws an error however,

java.io.IOException: Cannot run program "ipconfig/release": CreateProcess error=
2, The system cannot find the file specified
        at java.lang.ProcessBuilder.start(Unknown Source)
        at java.lang.Runtime.exec(Unknown Source)
        at java.lang.Runtime.exec(Unknown Source)
        at java.lang.Runtime.exec(Unknown Source)
        at threadio.run(checkmac.java:141)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find th
e file specified

Which I am not sure what means.

Any ideads what I'm doing wrong? Any better alternatives to disconnect from the router?

Shouldn't it be `ipconfig /release` (note the space), also, generally speaking, it's usually easier to use `ProcessBuilder` and separate each command and parameter as it's own argument `new ProcessBuilder("ipconfig", "/release");` — MadProgrammer, Mar 25 '15 at 05:32
@MadProgrammer If you are on Windows, try `ipconfig/release"` from the command line — Scary Wombat, Mar 25 '15 at 05:33
The Windows command line has bug-compatible behavior that splits tokens on slashes. I doubt that the Windows equivalent of `exec` does the same. — chrylis -cautiouslyoptimistic-, Mar 25 '15 at 05:35
It was the space that did it, thanks. It's weird though, it works without the space if I type it directly in cmd. — StupidQuestions, Mar 25 '15 at 05:39

score 0 · Accepted Answer · answered Mar 25 '15 at 05:40

0

It works with a space

Process result = Runtime.getRuntime().exec("ipconfig /release");

answered Mar 25 '15 at 05:40

StupidQuestions

347
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10

You can try with this also C:/Windows/System32/ipconfig.exe /release,, giving complete path of the ipconfig – Kick Mar 25 '15 at 05:43

score 0 · Answer 2 · answered Mar 25 '15 at 05:48

0

Assuming that ipconfig.exe is in the PATH, then Runtime.exec is capable of finding it, if it is not, you will need to supply the fully qualified path to it.

answered Mar 25 '15 at 05:48

kk1992

153
1
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Java Runtime.getRuntime().exec("ipconfig/release"); returns error?

2 Answers2