Runtime.exec() on shell script - unix

Hello all.
I'm gonna run a shell script and its parameter on unix solaris.
This is the whole command:
-> ex.sh "03/02/03 11:22:00"
'ex.sh' consists of the line like this.
-> ex date="$SSCREATE"
So, I expect "03/02/03 11:22:00" would be replaced with '$SSCREATE'
BTW, in Java class I invoke the shell in this way.
Process p = Runtime.getRuntime().exec("./ex.sh \"03/02/03 11:22:00\"");
InputStreamReader in = new InputStreamReader(p.getInputStream());
BufferedReader br = new BufferedReader(in);
But I can't get any output from this, I mean, when I use
'br.readLine()'
Why is that? Do I miss something?
Thanks in advance.

Thanks Jason.
Actually, I succeeded to run only 'whatever.sh'.(without any parameters) - No problems using Runtime.exec().
But, according what you wrote, is '/usr/bin/sh' a must as a prefix before real commnad line?
And what if the argumet has "(double quote) at the both ends?
I'd be glad if you show me the example.
Thank you again.

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The pipe symbol is interpreted by the shell, so you'd need the command you execute to be a shell (/bin/sh, /bin/csh /bin/bash, etc.) and the rest of it to be the args to that shell.
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Hi I am facing the same problem
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at java.lang.VMClassLoader.resolveClass(java.lang.Class) (/usr/lib/libgcj.so.5.0.0)
at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.5.0.0)
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at java.lang.Class.forName(java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at JvThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
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From the Runtime.exec documentation:
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Access to the program file was denied.
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EOF
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I'm also having a problem making my shell script unix executable. I have tried chmod +x path/to/script and then I killall Finder but nothing happens. Am I doing something wrong?
Are you trying to make your script "Double-Clickable"?
Then you still need to do the
chmod +x /path/to/script
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myscript.command
where the .command is the important part, which the Finder will treat as something it should execute as a shell script when double-clicked.
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Hello,
I would like to call Runtime.exec(String[], String[]), using the already existing environment variables with some modifications. Anyone have a tip how to accomplish this?

ugly hack, yes but it should work:
in pseudocode:
Process p = Runtime.exec(my Shell's name);
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Runtime.exec with a unix shell script

I've done a lot of google'ing and haven't found a definitive answer to my question, including the JavaWorld article that is pointed to quite often. Scenario1 - The program calling Runtime.exec is running in /dir1 and I have a script called test.sh in /dir2 (neither directory are in the path). If I call Runtime.exec("test.sh", null, "/dir2"), I get java.io.IOException: test.sh: not found. However, if I do "touch test.sh" AND "chmod +x test.sh" in /dir1 and call the same exec, it works AND runs the script in /dir2 not /dir1?!?! Also, if I copy /dir2/test.sh /dir1/test.sh and I call exec("test.sh"), it works fine. Scenario2 - If I get rid of /dir1/test.sh and call exec("/dir2/test.sh", null, "/dir2") OR exec("/bin/sh test.sh", null, "/dir2") - both of those work. I just don't get Scenario1. Why does having the dummy executable test.sh in /dir1 allow it to run in /dir2 OR if the script is in the local directory of the process calling exec, why does it work without adding the path? It doesn't seem consistent. Seems like the working directory I specify isn't set before trying to run it or something. On the flip side, if I have a java class in /dir2 called test.class, I can call exec("java test", null, "/dir2") and it just runs without jumping through any hoops - although I think the explanation for that is that "java" is in the path. Let me know what you think.
Gary

I think the problem is that the three argument version of exec specifies the command to run (should be full path to it if it is not in the current dir), the environment, then the working directory. The working directory will not help java to find the command to run in the first place. The following does work as you say:
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Java exec() of UNIX shell script

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p = Runtime.getRuntime().exec( cmdLine);
to execute a UNIX shell script, for example:
#!/bin/ksh
. /export/pc112477/freeware/work1/wsEnv
export PATH=/opt/sfw/bin:/usr/ccs/bin:/usr/bin:/usr/ucb:$PATH
cd /export/pc112477/freeware/work1/usr/src/pkgdefs/SFWnmap
/usr/ccs/bin/make -e ROOT=$ROOT install
RESULT=$?
if [ $RESULT = 0 ]
then
echo "Package source"
cd /export/pc112477/freeware/work1/usr/src/pkgdefs/SFWnmapS
/usr/ccs/bin/make -e ROOT=$ROOT install
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exit $RESULT
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For anyone who stumbles across this and needs an answer:
To empty the standard error and output, you need to use getErrorStream() and getInputStream() on the Process object created when you execed your command. Create new InputStreamReaders with the streams from the process, then wrap those with BufferedReaders and read each line with a while loop. This is the basic thing you need to do:
try{
Process proc = Runtime.getRuntime().exec(command);
InputStreamReader isr = new InputStreamReader(proc.getErrorStream());
BufferedReader errReader = new BufferedReader(isr);
String line;
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<do something with each line of error>
} //end try
catch(<errors>) {
<do something with errors>
} //end catch
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Parameter to shell script using Runtime.exec(string)

Hi all, ( Speciall hi to dheeraj tak )
Briefly : How do i pass an arguement to a non - java executible being called using Runtime.exec.
In detail : i am using Runtime.exec to call a shell script : The code is as follows:
String callAndArgs[] = {"/home/tom/jakarta-tomcat-4.1.24/webapps/dash/script.sh"};
try {
Runtime rt = Runtime.getRuntime();
Process child = rt.exec(callAndArgs);
This works properly & calls the shell script which in turn invokes some other executible (c file).
$HOME/midi/test/build/bin/<C-EXECUTIBLE>
Here i am specifying the name (say hello.exe ) . So far so good.
I want to make this happen dynamiclaly. so i need to pass the name of the executible as a parameter to the script.
To pass a parameter i hav to change the string to :-
String callAndArgs[] = {"/home/tom/jakarta-tomcat-4.1.24/webapps/dash/script.sh <C-EXECUTIBLE HERE>"};
and the script to
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Thanx in advance

some 1 plz tell me the difference :-
This is the documentation of Runtime.exec that i found :-
1> exec
public Process exec(String command) throws IOException
Executes the specified string command in a separate process.
The command argument is parsed into tokens and then executed as a command in a separate process. This method has exactly the same effect as exec(command, null).
Parameters:
command - a specified system command
Complete refernce says : Process (String progName) ----- Executes a program specified by programname as a seperate process.
2> exec
public Process exec(String cmdarray[]) throws IOException
Executes the specified command and arguments in a separate process.
The command specified by the tokens in cmdarray is executed as a command in a separate process. This has exactly the same effect as exec(cmdarray, null).
Parameters:
cmdarray - array containing the command to call and its arguments.
Complete reference says : Process exec(String comLineArray[]) ---- Executes the command line specified bythe string in comLineArray as a seperate process.
This means that there is provision 4 command line arguments...
how do u use it then????????????????????????????

Runtime.exec with Unix script

I want to execute unix script xxx.sh that I write it for running something and I will execute that script via java class I use
Runtime runTime = Runtime.getRuntime();
Process procRun = runTime.exec("/xxx/yyyy/testing.sh");
xxx and yyyy is path in my unix server and testing.sh is unix script
when I run this class it return true result but that unix script doesn't working or execute following my program in java class
please help me to solve this problem
Regards,
sobig

when I run this class it return true result but that unix script doesn't
working or execute following my program in java classwhat do you mean it returns true....
and how do you know that it does not execute your script.... its probably going to be started as a bg process.... try doing something like creating a directory or something in the script .sh to be sure that it ran.... (just for testing).... im quite sure that it will execute a .sh file like that....

Error while trying to execute a unix shell script from java program

Hi
I have written a program to execute a unix shell script in a remote machine. I am using J2ssh libraries to estabilish the session connection with the remote box.The program is successfully able to connect and authenticate with the box.
The runtime .exec() is been implemented to execute the shell script.I have given below the code snippet.
try {
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     String a_mib_name = "test.sh";
     String cmd[] = new String[] {"/usr/bin/bash", file_location1, a_mib_name};
     Runtime rtime = Runtime.getRuntime();
     Process p = rtime.exec(cmd, null, file_location);
System.out.println( "Connected to the server1" );
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = br.readLine();
while(line !=null)
System.out.println(line);
line = br.readLine();
br.close();
p.getErrorStream ().close ();
p.getOutputStream().close();
int retVal = p.waitFor();
System.out.println("wait " + retVal);
//session.executeCommand("ls");
catch (IOException ex) {
I get an error message
Connected to the server
java.io.IOException: Cannot run program "/usr/bin/bash" (in directory "\usr\bin"
): CreateProcess error=3, The system cannot find the path specified
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at SftpConnect.main(SftpConnect.java:143)
Caused by: java.io.IOException: CreateProcess error=3, The system cannot find th
e path specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
I am sure of the file path where the bash.sh and test.sh are located.
Am i missing something? Any help would be greatly appreciated.
Thanks
Senthil

Hi, I am using a simple program to connect to a RMI server and execute shell script. I use the Runtime.exec aommand to do the same.
The script is sh /tmp/pub/alka/test.sh /tmp/pub/alka/abc/xyz/ul ul
The script when run from the server, gives no errors. But when ran using rthe above method in java, gives errors as follows,
Mycode:
String command = "/bin/sh /tmp/pub/alka/test.sh /tmp/pub/alka/abc/xyz/ul ul";
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(command);
int exitVal = proc.exitValue();
System.out.println("Process exitValue: " + exitVal);
java.io.IOException: CreateProcess: /bin/sh /tmp/pub/alka/test.sh /tmp/pub/alka/abc/xyz/ul ul error=3
     at java.lang.ProcessImpl.create(Native Method)
     at java.lang.ProcessImpl.<init>(Unknown Source)
     at java.lang.ProcessImpl.start(Unknown Source)
     at java.lang.ProcessBuilder.start(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
     at DecryptTest.main(DecryptTest.java:18)
Can anyone please help

Error while executing unix shell script from java program

Hi All,
I am trying to execute unix shell script from a java program using Runtime.execute() method by passing script name and additional arguments.
Code snippet :
Java Class :
try{
     String fileName ="test.ksh";
     String argValue ="satish"; // value passed to the script
     String exeParam = "/usr/bin/ksh "+fileName+" "+argValue;
     Process proc = Runtime.getRuntime().exec(exeParam);
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     sop("Exit Value is : "+exitValue);
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e.printStackTrace();
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export -- application realated paths..
nohup abc.exe 1> test.log 2>&1;
$1
exit.By running the above java class , i am getting exit Value: 139 and log file test.log of 0 bytes.
when i am running the same command (/usr/bin/ksh test.ksh satish) manually, it's calling abc.exe file successfully
and able generate the logs properly.
Pls let us know where exactly i am stuck..
Thanks in advance,
Regards,
Satish

Hi Sabre,
As per the guidelines provided by the article, i had done below changes..
InputStream is = null;
InputStreamReader iStreamReader = null;
BufferedReader bReader = null;
String line = null;
try{
String fileName ="test.ksh";
String argValue ="satish"; // value passed to the script
String exeParam = "/usr/bin/ksh "+fileName+" "+argValue;
Process proc = Runtime.getRuntime().exec(exeParam);
is = proc.getErrorStream();
iStreamReader = new InputStreamReader(is);
bReader = new BufferedReader(iStreamReader);
System.out.println("<ERROR>");
while((line = bReader.readLine()) != null)
System.out.println("Error is : "+line);
System.out.println("</ERROR>");
int exitValue = proc.waitFor();
sop("Exit Value is : "+exitValue);
catch(Exception e)
e.printStackTrace();
Now , it's showing something like..
<ERROR>
</ERROR>

How to execute unix shell script from Java ...

Hi,
Anyone know how to execute unix shell script from Java?
Suppose I have several shell scripts written in perl or tcl or bash.
I just want to catch the output of that script.
Is there any ready to use module/object for this?
Please let me know, this is quite urgent for my study assigment.
Thanks in advance,
Regards,
me

Look up Runtime.exec()

Runtime.exec() on shell script - unix

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