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System Calls

Timers	sleep, wait
Process Calls	exec, system

System Calls Functions Reference
Here's a quick reference of the available system call functions, in alphabetical order.

Unless otherwise noted, these functions operate on $_ by default.

• exec - executes a system command and never returns

      exec PROGRAM list
  
      exec "notepad";     # opens Notepad. Perl script ends.
      

• sleep - stops script execution for specified seconds

      sleep EXPR
   
      sleep 5;            # pauses for 5 seconds
      

• system - executes a system command and returns after the called command completes

      system PROGRAM LIST 
  
      system 'notepad'    # opens Notepad, waits for it to complete
      

• wait - waits for a child process to terminate

      wait
      

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