java.io.IOException: Cannot run program error=2, No such file or directory

问题

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();
 }

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:
}

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?

回答1:

Looks like it is similar to the problem I faced, when invoking a shell script (contains system & user created commands) from autosys [autosys -> shell -> Java -> ProcessBuilder]
ProcessBuilder will from a command and execute in Linux machine.
This worked when i log in to Linux box and execute the script but it didn't work when i invoke from autosys.
The actual problem is $PATH variable, which is not being set with the directory of the user created command.
I echo the $PATH variable when executing from Linux machine and Autosys in the shell script, $PATH variable is not set properly when executing from Autosys , after appending user command path to the $PATH variable it worked.
which (cmd) will return the directory of the command, append this directory with $PATH then it will work.

Try adding your script path to $PATH and execute from your application

回答2:

On unix-like systems, the shell only executes programs residing in the current directory if given an unambiguous path to it. This is to prevent an attacker from, say, putting a program named ls in your home directory which would execute instead of the actual ls program residing in /bin/ls. Thus, the current directory is excluded from the PATH.

Also, try moving

int exitVal=process.waitFor();

to above the while loop.

来源：https://stackoverflow.com/questions/11787479/java-io-ioexception-cannot-run-program-error-2-no-such-file-or-directory

标签

exec

csh