How to execute Linux command from Java app.

You can use "built-in" shell commands, you just need to invoke the shell and tell it to run the command. See the -c switch in the man page for your shell. But, "ls" isn't built-in anyays.

If you use exec, you will want to set the directory with the dir argument to exec, or add it to the command or cmdarray. See the API for the variants of java.lang.Runtime.exec(). (If you're invoking it repeatedly, you can most likely modify a cmdarray more efficiently than having exec() decompose your command).

You will also definitely want to save the returned Process and read the output from it (possibly stderr too and get an exit status). See API for java.lang.Process. Here's an example

java.io.BufferedReader br =

new java.io.BufferedReader(new java.io.InputStreamReader(

Runtime.getRuntime().exec ("/sbin/ifconfig ppp0").

getInputStream()));

while ((s = br.readLine()) != null) {...

blaine.simpson at 2007-6-29 2:47:02 >