Running linux commands from pl/sql

Question

Hi, I'm using a java class to run os commands but it doesn't work, i think it's permissions but i cant understand why.
the java class is the following:
import java.io.*;
import java.lang.*;
public class RunCmd extends Object{
public static int RunThis(String args){
Runtime rt = Runtime.getRuntime();
int rc = -1;
try{
Process p = rt.exec(args);
int bufSize = 4096;
BufferedInputStream bis =
new BufferedInputStream(p.getInputStream(), bufSize);
int len;
byte buffer[] = new byte[bufSize];
while ((len = bis.read(buffer, 0, bufSize)) != -1)
System.out.write(buffer, 0, len);
rc = p.waitFor();
catch (Exception e)
e.printStackTrace();
rc = -1;
finally
return rc;
the pl/sql function i created:
function run_cmd(p_cmd in varchar2) return number as language java name 'RunCmd.RunThis(java.lang.String) return oracle.sql.NUMBER';
i gave the following permissions:
begin
dbms_java.grant_permission(user, 'SYS:java.io.FilePermission', '/home/mails/*', 'execute');
dbms_java.grant_permission(user, 'SYS:java.io.FilePermission', '/home/mails/*', 'write');
dbms_java.grant_permission(user, 'SYS:java.io.FilePermission', '/home/mails/*', 'read');
dbms_java.grant_permission(user, 'SYS:java.io.FilePermission', '/home/mails/*', 'delete');
dbms_java.grant_permission(user, 'SYS:java.lang.RuntimePermission', '*', 'readFileDescriptor');
dbms_java.grant_permission(user, 'SYS:java.lang.RuntimePermission', '*', 'writeFileDescriptor');
Dbms_Java.grant_Permission(user, 'SYS:java.lang.RuntimePermission', 'readFileDescriptor', '');
Dbms_Java.grant_Permission(user, 'SYS:java.lang.RuntimePermission', 'writeFileDescriptor', '');
dbms_java.grant_permission(user, 'java.io.FilePermission', '/home/mails/*', 'execute');
dbms_java.grant_permission(user, 'java.io.FilePermission', '/home/mails/*', 'write');
dbms_java.grant_permission(user, 'java.io.FilePermission', '/home/mails/*', 'read');
dbms_java.grant_permission(user, 'java.io.FilePermission', '/home/mails/*', 'delete');
dbms_java.grant_permission(user, 'java.lang.RuntimePermission', '*', 'readFileDescriptor');
dbms_java.grant_permission(user, 'java.lang.RuntimePermission', '*', 'writeFileDescriptor' );
Dbms_Java.grant_Permission(user, 'java.lang.RuntimePermission', 'readFileDescriptor', '');
Dbms_Java.grant_Permission(user, 'java.lang.RuntimePermission', 'writeFileDescriptor', '');
commit;
end;
The command i'm trying to execute is:
select run_cmd('/bin/sh -c "ls -ltr /home/mails> /home/mails/teste.txt"') from dual;
i gave chmod 777 /home/mails and i already run this command directly in console mode and works just fine, so i dont think it's permissions related to the user oracle.
when i run
select run_cmd('/bin/sh -c "ls -ltr /home/mails> /home/mails/teste.txt"') from dual;
it returns 2
if i run
select run_cmd('/bin/sh -c ls -ltr /home/mails> /home/mails/teste.txt') from dual;
it returns 127
if i run just
select run_cmd('ls -ltr /home/mails> /home/mails/teste.txt') from dual;
it returns -1
if anyone as any clue please, i'm trying to solve this problem for 2 days and i don't have any clue for the solution...

Answer 1

when i remove the /bin/sh -c it returns -1
i think that it runs the command because there is a diference in the return value from a valid command a an invalid, for example:
if i run a valid command
select k_cs_controlo.run_cmd('/bin/sh -c "ls -ltr /home/mails > /home/mails/teste.txt"') from dual;
it retuns 2
if i run an invalid command(removed the " between the ls command)
select k_cs_controlo.run_cmd('/bin/sh -c ls -ltr /home/mails > /home/mails/teste.txt') from dual
it returns 127
thanks for the replies Sven