Execute an Unix command with pipe

Hi,
How do I execute a unix command with pipe from JAVA runTime.exec(cmd)? for example: "ls -l |wc -l"
should return number of files. However, there is no output result. If I use "ls -l" as command argument, it gives file list.
Here is my program:
public static void main(String[] args) {
try {
Runtime runCmd = Runtime.getRuntime();
System.out.println("sys testing");
Process retProc = runCmd.exec(args[0]);
BufferedReader bread = new BufferedReader
(new InputStreamReader(retProc.getInputStream()) );
String out = bread.readLine();
while ( out != null ) {
System.out.println(out);
out = bread.readLine();
DataOutputStream outSt = new DataOutputStream(retProc.getOutputStream() );
outSt.writeChars(args[1]);
outSt.flush();
} catch (Exception ie) {
ie.printStackTrace();
Thanks in advance,
Jeff

I got my answer !
No need to reply

Similar Messages

How to run Unix command with Pipe ( | )?

Dear Friends,
I have to execute the below unix command through java program.
*ps -ewwo pid,args | grep -E "abc.sh|xyz.jar" | gawk '{ print $1 }' | wc -l*
My code to execute this command is,
Runtime run = Runtime.getRuntime();
File workDir = new File("/root/sat");
String psCmd = "ps -ewwo pid,args | grep -E \"abc.sh|xyz.jar \" | gawk '{ print $1 }' | wc -l";
Process process = run.exec(psCmd, null, workDir);
          String line;
          int i = process.waitFor() ;
          if(i == 0) {
          BufferedReader buf = new BufferedReader( new InputStreamReader( process.getInputStream() ) ) ;
          while ( ( line = buf.readLine() ) != null )
               System.out.println("Line - ["+line+"]") ;
          } else {
               BufferedReader stdErr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
               // read the output from the command
               while ((line = stdErr.readLine()) != null) {
               System.out.println(line);
               }When i execute this command, i'm getting output as,
ERROR: Garbage option.
When i analyse the above error, i found that, the PIPE ( | ) command is not supported through java.
Could anyone please help me how to execute the above unix command (with | ) in java?
Thanks in advance,
Sathish

The pipe has to be interpreted by a shell so you need
String[] psCmd =
    "sh",
    "-c"
    "ps -ewwo pid,args | grep -E \"abc.sh|xyz.jar \" | gawk '{ print $1 }' | wc -l"
Process process = run.exec(psCmd, null, workDir);You should also read, re-read and then implement the recommendations in the 4 sections of http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .

Executing multiple UNIX commands

Hello
I would like to execute from a Java application the UNIX command :
ls -l | grep ob
I first execute the command "ls -l" and write the output stream in the input stream of the command "grep ob"
My problem is that the second command is waiting for the EOT character and i don't know how to send it. I tried to write the char 4 but it doesn't work
Any idea to run commands with pipes ?
Chris

I reply to myself in case someone else wants to do that job :
    private static byte[] execUNIXcmd(String commande, byte[] outputData, boolean closeStream) {
     Runtime runtime = Runtime.getRuntime();
     Process process = null;
     InputStream inputStream = null;
     OutputStream outputStream = null;
     byte[] bBuf = null;
     try {
         process = runtime.exec(commande);
         outputStream = process.getOutputStream();
         inputStream = process.getInputStream();
         if (outputData != null) {
          outputStream.write(outputData);
         if (closeStream) {
          outputStream.close();
         inputStream = process.getInputStream();
         process.waitFor();
         bBuf = new byte[inputStream.available()];
         inputStream.read(bBuf, 0, inputStream.available());
         return bBuf;
     } catch (InterruptedException e) {
         System.err.println("ERROR : Enable to wait the process");
         return null;
     } catch (IOException e) {
         System.err.println("ERROR : Enable to read input lines");
         return null;
    // Fonction principale
    public static void main(String s[]) {
     byte[] result = null;
     result = execUNIXcmd("ls -l", null, false);
     result = execUNIXcmd("grep java", result,true);
     result = execUNIXcmd("grep ~", result,true);
     System.out.println(new String(result));
    }I missed to close the outputStream of the command waiting for it.
Chris

At CRS-1,how can i use show command with pipe | ?

HI,ALL
when I use show command with pipe on the CRS-1,the command invalid
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line |errors
                                                                   ^
% Invalid input detected at '^' marker.
========================================================
But Previously on the cisco 7609,I can use the show command
GZ-DM-SR-1.MAN.7609#show int | include line |err
Vlan1 is down, line protocol is down
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 interface resets
Vlan11 is administratively down, line protocol is down
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 interface resets
Vlan99 is down, line protocol is down
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 interface resets

RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line |errors
                                                                   ^
% Invalid input detected at '^' marker.
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line |?
|
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line | |?
                                                                    ^
% Invalid input detected at '^' marker.
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line | ?
begin    Begin with the line that matches
exclude Exclude lines that match
file     Save the configuration
include Include lines that match
utility A set of common unix utilities
<cr>
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line |
% Incomplete command.
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line |errors
                                                                   ^
% Invalid input detected at '^' marker.
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line | ?
begin    Begin with the line that matches
exclude Exclude lines that match
file     Save the configuration
include Include lines that match
utility A set of common unix utilities
<cr>
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line |?
|
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line | include er$
Thu Jan 15 22:36:24.120 GMT
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#
RP/0/RP0/CPU0:JA-DL-CR-1.MAN.CRS-1#show interfaces | include line
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Loopback0 is up, line protocol is up
Loopback1 is up, line protocol is up
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Permission denied when I execute a unix command from within my java applet.

Hi Gang,
Forgive me if this is not the appropriate forum for this problem. I'm posting this problem on this forum since I got no answers on the other forum I posted on.
I've written a simple java applet that runs a unix command and then displays some information. The applet compiles fine, and runs perfectly from the command line on my unix system.
However, when I point a browser at the applet from my desktop PC I get the following error as taken from the java console:
Exception in thread "AWT-EventQueue-2" java.security.AccessControlException: access denied (java.io.FilePermission <<ALL FILES>> execute)
This is of course the first line in a long line of error messages. It appears that I am not able to execute a command on the unix system through my applet. I know the problem is with trying to execute a unix command since commenting it causes no error in the web browser. This is the command I'm using in java to execute the unix command:
p = Runtime.getRuntime().exec("ps");
Here's the html file on the unix system:
<html>
<head></head>
<body>
<appletcode=G.class height="250" width="400">
Your browser does not support the applet tag.
</applet>
</body>
</html>
I won't list the java code since it is compiling and working on the command line. But, if you want to see it I'll provide it.
I've done quite a bit of research on this and it seems that a great number of people have similar problems reading or executing files through java. I have yet to find a solution to this problem.
Here are some details about my setup:
Server:
HP9000 running HP/UX 11.23
Apache Web Server 2.0.35
Java 1.5
Desktop PC:
Win2K Pro
Internet Explorer 6
Java 1.6
If you have a solution I would be very grateful! This problem is keeping me from writing my application!
thanks!
kev

Multi-posted.
Already answered here http://forum.java.sun.com/thread.jspa?threadID=5225314&messageID=9916327#9916327

Permission denied when I execute a unix command from inside my Java applet.

Hi Gang,
Forgive me if I'm posting this to the wrong forum! I didn't get any answers on the previous forum that I posted this to.
I've written a simple java applet that runs a unix command and then displays some information. The applet compiles fine, and runs perfectly from the command line on my unix system.
However, when I point a browser at the applet from my desktop PC I get the following error as taken from the java console:
Exception in thread "AWT-EventQueue-2" java.security.AccessControlException: access denied (java.io.FilePermission <<ALL FILES>> execute)
This is of course the first line in a long line of error messages. It appears that I am not able to execute a command on the unix system through my applet. I know the problem is with trying to execute a unix command since commenting it causes no error in the web browser. This is the command I'm using in java to execute the unix command:
p = Runtime.getRuntime().exec("ps");
Here's the html file on the unix system:
<html>
<head></head>
<body>
<appletcode=G.class height="250" width="400">
Your browser does not support the applet tag.
</applet>
</body>
</html>
I won't list the java code since it is compiling and working on the command line. But, if you want to see it I'll provide it.
I've done quite a bit of research on this and it seems that a great number of people have similar problems reading or executing files through java. I have yet to find a solution to this problem.
Here are some details about my setup:
Server:
HP9000 running HP/UX 11.23
Apache Web Server 2.0.35
Java 1.5
Desktop PC:
Win2K Pro
Internet Explorer 6
Java 1.6
If you have a solution I would be very grateful! This problem is keeping me from writing my application!
thanks!
kev

Multi-posted.
Already answered here http://forum.java.sun.com/thread.jspa?threadID=5225314&messageID=9916327#9916327

How to execute a Unix Command in java

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Problem in executing a unix command through java

hi
i'm trying to execute unix command through java
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