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Index › Programming Questions & Help › Integration › exec() won't exec()
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exec() won't exec() (Read 1114 times)
neilb
exec() won't exec()
Sep 27th, 2006, 3:07am  
hi,
I'm trying to do the following in OSX:

try {
 Runtime.getRuntime().exec("ls ~/Desktop > ~Desktop/listing.txt");
} catch(IOException ioe) {
 ioe.printStackTrace();
 println("no can do");
}

This doesn't throw an exception, but it also doesn't visibly do anything (e.g., create the file it's supposed to create). It works fine from the command line. Any suggestions?

thanks!
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fry
Re: exec() won't exec()
Reply #1 - Sep 27th, 2006, 9:46pm  
the ~ is specific to the shell, and without a shell to interpret it, runtime.exec prolly won't work. i'd use full paths. i.e. System.getProperty("user.home") + "/Desktop". i'm not sure if > will work either, since that's also part of the shell, but i'm not sure at what level it's interpreted. much hunch is that > will work but ~ will not with exec().
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neilb
Re: exec() won't exec()
Reply #2 - Oct 3rd, 2006, 11:02pm  
Interesting. It turns out that both ~ and > fail silently, but

Runtime.getRuntime().exec("cp /Users/neil/Desktop/foo /Users/neil/Desktop/foo2");

is fine. Any thoughts on how to get a listing of a directory into a file or into a String[] without using > ?

thanks,
neil
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