Perl Process Management

You are free to use various ways to create new process in perl. Here are the following points to keep in mind

Every process is created using any of the mentioned methods, maintains its own virtual environment with-in %ENV special variable
You can use $$, special variable, to get the current process ID
You can also use $PROCESS_ID, special variable to get current process ID
All the open handles are dup()-ed in the child-processes, so that closing any handles in one process doesn't affect others
The function named exit() always exits just the child process which executes this function and the main process as a whole will not exit unless all the running child-processes have been exited

Perl Process Management Example

Let's take a look at the following example:

#!/usr/bin/perl

@files = `ls -l`;

foreach $file (@files){
   print $file;
}

1;

When the above perl program is executed, it lists all the files and directories present inside the current directory:

drwxr-xr-x 3 root root 4096 Sep 14 06:46 9-14
drwxr-xr-x 4 root root 4096 Sep 13 07:54 android
-rw-r--r-- 1 root root  574 Sep 17 15:16 index.htm
drwxr-xr-x 3  544  401 4096 Jul  6 16:49 MIME-Lite-3.01
-rw-r--r-- 1 root root   71 Sep 17 15:16 test.pl
drwx------ 2 root root 4096 Sep 17 15:11 vAtrJdy

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