Java Tutorials and Guides
CSS Tutorials and Guides
Java - Execute Shell Command Using Process Builder - MacOs
ProcessBuilder - in Java provides the ability to programatically execute shell command.
1. ProcessBuilder - Implementation
In this example, we will execute a ping command to google.com and display the response on the console.
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
public class ExecuteShellComandProcessBuilder {
public static void main (String [] args) throws IOException, InterruptedException{
String [] command = {"ping", "google.com"};
ProcessBuilder processBuilder = new ProcessBuilder(command);
processBuilder.directory(new File(System.getProperty("user.home")));
try {
Process process = processBuilder.start();
BufferedReader reader =
new BufferedReader (new InputStreamReader(process.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
int exitCode = process.waitFor();
System.out.println ("\nExited with error code : " + exitCode);
} catch (IOException e) {
e.printStackTrace();
}
}
}
Output:
vpn-133-230-1-300:~ softorks$ ping google.com
PING google.com (216.58.193.142): 56 data bytes
64 bytes from 216.58.193.142: icmp_seq=0 ttl=52 time=34.190 ms
64 bytes from 216.58.193.142: icmp_seq=1 ttl=52 time=32.910 ms
64 bytes from 216.58.193.142: icmp_seq=2 ttl=52 time=34.361 ms
64 bytes from 216.58.193.142: icmp_seq=3 ttl=52 time=33.286 ms
--- google.com ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 32.910/33.687/34.361/0.607 ms
vpn-133-230-1-300:~ softorks$
2. Show Running Processes Example
In this example, we will execute the ps command to show all the running processes, their owners and processes not attached to a terminal
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
public class ListDirectories {
public static void main (String [] args) {
String [] listDirectoryCommand = {"ps", "aux"};
ProcessBuilder pB = new ProcessBuilder(listDirectoryCommand);
pB.directory(new File(System.getProperty("user.home")));
try {
Process p = pB.start();
BufferedReader readOutput =
new BufferedReader (new InputStreamReader(p.getInputStream()));
String outputCommandLine;
while ((outputCommandLine = readOutput.readLine()) != null) {
System.out.println(outputCommandLine);
}
int exitCode = p.waitFor();
System.out.println ("\nExited with error code : " + exitCode);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Output:
root 91106 0.0 0.3 4682880 51644 ?? Ss Mon10AM 10:38.42 /.../... aaa socket
softorks 87125 0.0 0.0 4434696 5616 ?? Ss Mon09AM 1:06.66 /.../.../FinderSync
root 82265 0.0 0.0 4351464 8 ?? Ss Mon08AM 0:00.03 /.../.../..ManagerService
softorks 81331 0.0 0.0 4404032 4684 ?? S Mon04AM 0:44.65 /.../.../talagent
softorks 77742 0.0 0.0 4377756 560 ?? Ss Sun09PM 0:00.14 /.../.ClientScripter
softorks 76864 0.0 0.0 4436844 5596 ?? Ss Sun09PM 1:13.50 /.../.../FinderSync
softorks 76863 0.0 0.0 4849036 8 ?? Ss Sun09PM 0:00.14 /.../.../MTLCompilerService
softorks 76861 0.0 0.0 4841384 8 ?? Ss Sun09PM 0:00.18 /.../.../MTLCompilerService
softorks 76859 0.0 0.1 5033148 15108 ?? Ss Sun09PM 4:08.31 /.../...PanelService