I usually build my project using these two commands from command line (dos)

```
G:\> cd c:
C:\> cd c:\my\directory\where\ant\exists
C:\my\directory\where\ant\exists> ant -Mysystem
...
.....
build successful

```

What If I want to do the above from groovy instead? groovy has `execute()` method but following does not work for me:

```
def cd_command = "cd c:"
def proc = cd_command.execute()
proc.waitFor()

```

it gives error:

```
Caught: java.io.IOException: Cannot run program "cd": CreateProcess error=2, The
 system cannot find the file specified
        at ant_groovy.run(ant_groovy.groovy:2)

```