java.io.IOException：无法运行程序错误= 2，没有这样的文件或目录

我有一个Java类，其中调用了将执行脚本的runshellscript方法。它在mysql上运行良好，但我似乎无法找出为什么在psql下无法正常运行。这是我的runshell方法的摘录：

I have a java class in which I call a runshellscript method that will execute a script. It worked well with mysql but I cannot seem to find out why it wont work well with psql. Here is an excerpt of my runshell method:

public class RunShellScript {

public static void runShellScript (String unixCommand) 
{
 try {
     Runtime runtime=Runtime.getRuntime();
     //Process process=runtime.exec(new String [] { "/bin/csh", "-c", unixCommand});
     Process process=runtime.exec(new String [] {unixCommand});
     InputStream stderr=process.getErrorStream();
     InputStreamReader isr=new InputStreamReader (stderr);
     BufferedReader br=new BufferedReader (isr);
     String line=null;
     System.out.println("<ERROR>");

     while((line=br.readLine())!=null)
         System.out.println(line);

     System.out.println(line);
     int exitVal=process.waitFor();
     System.out.println("Process exitValue:" + exitVal);
 }
 catch (Throwable t)
 {
     t.printStackTrace();
 }

问题是，当我将其放在鼠标单击的事件后面时，它会说出命令未找到。这是代码，因为发生了突发事件

the problem is that when i put this behind a mouse clicked event it says command not found. Here is the code beuind the mous event

private void jMenuItem13MousePressed(java.awt.event.MouseEvent evt)    {                                         

    String shellCommand="vobs/tools/Scripts/DataValidation/mysqlconnection.csh";
    RunShellScript.runShellScript(shellCommand);
    // TODO add your handling code here:
}                     

奇怪的事情是当我直接转到脚本所在的目录并键入./mysqlconnection时，脚本可以工作。但是，当我只键入mysqlconnection时，说找不到命令。

The weird thing is that when I go directly to the directory where the script resides and type ./mysqlconnection the script works. But when i just type mysqlconnection is says command not found. Somehow it is not recognizing my script name as a command?