Develop Reference

Execute behind the scenes bash command from Java ProcessBuilder

I'm using in windows:
builder = new ProcessBuilder("cmd.exe", "/c", my_command);
Process p = builder.start();
i've tried to replicate that behaviour, just for macOS
i've tried theese and none of them have worked:
1. builder = new ProcessBuilder("bin/bash", "-c", my_command);
2. builder = new ProcessBuilder("osascript", my_command);
Process p = builder.start();
Will appreciate the help
Thanks

The paths you have are incorrect, they should be:
/bin/bash
and
/usr/bin/osascript

This one worked for me:
builder = new ProcessBuilder("bash", "-c", command);
Process process = builder.start();

Java switch directories and then fire command with parameters

Hey all I am trying to change directories and then run my command with parameters.
final String path = "\\Local// Apps\\IBM\\SDP\\scmtools\\eclipse";
final String command = "scm help";
final String dosCommand = "cmd /c \"" + path + "\"" + command;
final Process process = Runtime.getRuntime().exec(dosCommand);
final InputStream in = process.getInputStream();
int ch;
while((ch = in.read()) != -1) {
System.out.print((char)ch);
}
It runs without errors but outputs nothing. However, this is what shows up after it finishes:
<terminated, exit value: 0>C:\Local Apps\IBM\SDP\jdk\bin\javaw.exe (Jul 22, 2019, 11:21:37 AM)
The expected output should be:
So am I doing this correctly?
AS suggested by Andreas
Process p = null;
ProcessBuilder pb = new ProcessBuilder("scm.exe");
pb.directory(new File("C:/Local Apps/IBM/SDP/scmtools/eclipse"));
p = pb.start();
I get the following error:
Cannot run program "scm.exe" (in directory "C:\Local Apps\IBM\SDP\scmtools\eclipse"): CreateProcess error=2, The system cannot find the file specified

You should use ProcessBuilder instead of Runtime.exec, e.g.
Process proc = new ProcessBuilder("scm.exe", "help")
.directory(new File("C:\\Local Apps\\IBM\\SDP\\scmtools\\eclipse"))
.inheritIO()
.start();
proc.waitFor(); // optional
You can also go through the command interpreter if needed, e.g. if the command is a script (.bat or .cmd file):
Process proc = new ProcessBuilder("cmd", "/c", "scm", "help")
.directory(new File("C:\\Local Apps\\IBM\\SDP\\scmtools\\eclipse"))
.inheritIO()
.start();
proc.waitFor();
The inheritIO() means that you don't need to process the commands output. It will be sent to the console, or wherever Java's own output would go.

Run shell script from java

I have sendmail file that contains this script echo "sample message" | /usr/bin/swaks --to email#gmail.com I want to run it from java using this code :
ProcessBuilder pb = new ProcessBuilder("sendmail");
Process p = pb.start()
but the email is not sent. Whats wrong and how can i fix this?
edit : running ./sendmail is working, and the email is sent to my mail

I think the problem is that your java application is ending before the script finishes.
Try this:
ProcessBuilder pb = new ProcessBuilder("./sendmail.sh");
Process p = pb.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
String readline;
int i = 0;
while ((readline = reader.readLine()) != null) {
System.out.println(++i + " " + readline);
}
The above code should print out what your command prints which could help you debug. It also has the side effect of blocking until the script is finished.
If that works and you don't care about the output, you can do this:
ProcessBuilder pb = new ProcessBuilder("./test.sh");
Process p = pb.start();
p.waitFor();

Java runtime's .exec() wont open executable

I am trying to execute another file using Runtime and Process
try
{
Runtime run = Runtime.getRuntime();
Process pro = run.exec("C:\\Users\\user\\Desktop\\file.exe");
}
catch(Exception a)
{
a.printStackTrace();
}
I can enter this command in either run or cmd and am able to open the file but running it through my program it won't open. There are no errors, it just doesn't open.

To better understand what is going on (and it is actually a requirement of the Process class), you need to redirect the input and error streams of your process - and using a ProcessBuilder is the recommended way to start processes:
public static void main(String[] args) throws Exception {
ProcessBuilder pb = new ProcessBuilder("C:\\Users\\user\\Desktop\\file.exe");
runProcess(pb)
}
private static void runProcess(ProcessBuilder pb) throws IOException {
pb.redirectErrorStream(true);
Process p = pb.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
}

You must do
Process pro = run.exec("C:\\Users\\user\\Desktop\\file.exe",null,"C:\\Users\\user\\Desktop\\");
Please see Run .exe file from Java from file location

Try this way:
String []cmdarray = new String[4];
cmdarray[0] = "cmd";
cmdarray[1] = "/c";
cmdarray[2] = "start";
cmdarray[3] = "C:\\Users\\user\\Desktop\\file.exe";
Runtime.getRuntime().exec(cmdarray);

Try this one, create a batch file ,like start_file.bat.
The content like this:
cd C:\Users\user\Desktop ----- Goto this directory
C: ----- This line is very important
file.exe
Both the two approaches work well.
Runtime r = Runtime.getRuntime();
String []cmdarray = new String[4];
cmdarray[0] = "cmd";
cmdarray[1] = "/c";
cmdarray[2] = "start";
cmdarray[3] = "C:/users/desktop/start_file.bat";
r.exec(cmdarray);
And this one:
r.exec("C:/users/desktop/start_file.bat");
You can read the output from this new process.

Running cmd with spaces from java

I want to run a command through java session. The command contains spaces. as
"C:\With Space\sample.exe" -command_option "C:\Source File\test.c"
This works if
C:\WithoutSpace\sample.exe -command_option "C:\Source File\test.c"
if we keep the quotes in C:\With Space\sample.exe we get error as :'The filename, directory name, or volume label syntax is incorrect.' and if we remove the quotes then the exe do not run...
please guide.
Thanks,

Try this:
String[] arg = {"cmd","/c","C:/Source File/test.c"};
ProcessBuilder pb = new ProcessBuilder(arg);
Process pr = pb.start();
Also, you can use Runtime.exec(String[]) version
Example:
Runtime rt = Runtime.getRuntime();
String[] args = { "cmd", "/c", "C:/Source File/test.c"};
try
{
Process proc = rt.exec(processCommand);
}

You can try this:
Process process = Runtime.getRuntime().exec("'C:\WithoutSpace\sample.exe' -command_option 'C:\Source File\test.c'");
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
while ((line = in.readLine()) != null) {
//line contain command output
}