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Running an operating system command from Java
Fundamental classes example from a Well House Consultants training course
More on Fundamental classes [link] Source code: Discfree.java Module: J714
/* Running an operating system command from Java
Java is a portable language. That's until you want to run something that's an operating system command. You'll find tricks like this are well hidden and you'll be encouraged to find the equivalent standard method to do the same job - no bad thing if you're hoping to write portable code! */ import java.io.*; public class Discfree { public static void main (String [] args) throws IOException { String [] Command = null; if (System.getProperty("os.name").equals("Linux")) { Command = new String[1]; Command[0] = "df"; } if (System.getProperty("os.name").equals("Mac OS X")) { Command = new String[1]; Command[0] = "df"; } if (System.getProperty("os.name").equals("Solaris")) { Command = new String[2]; Command[0] = "df"; Command[1] = "-k"; } if (Command == null) { System.out.print("Can't find free space on "); System.out.println(System.getProperty("os.name")); System.exit(1); } Process Findspace = Runtime.getRuntime().exec(Command); BufferedReader Resultset = new BufferedReader( new InputStreamReader ( Findspace.getInputStream())); String line; while ((line = Resultset.readLine()) != null) { System.out.println(line); } } } /* Sample Output munchkin:j714 grahamellis$ java Discfree Filesystem 512-blocks Used Available Capacity Mounted on /dev/disk0s2 236306352 27493824 208300528 12% / devfs 213 213 0 100% /dev map -hosts 0 0 0 100% /net map auto_home 0 0 0 100% /home munchkin:j714 grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
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