Linux command to find the number of processes running in a PC.

Command to find the number of processes running in a PC

For eg:-, if I need to find the number of postgres processes running in my pc, just run the command,
ps -C postgres | wc -l

JSP program to write current date and time to a text file

String str;
java.util.Date currentDate = new java.util.Date(); //gets the current date
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
str = sdf.format(currentDate);

String nameOfTextFile =getServletContext().getRealPath("imp.txt");
try
{
        PrintWriter pw = new PrintWriter(new FileOutputStream(nameOfTextFile));
        pw.println(str);
        //clean up
        pw.close();
}
catch(IOException e)
{
        out.println(e.getMessage());
}