how to run piece of code just before the exit of perl script

Question

In my script, I need to load some info from disk file and during the run of script the info might be changed.To keep the consistence of the file in disk and it\'s in memory

Answer 1

I think you're looking for END block:

END {
    # cleanup
}

An END code block is executed as late as possible, that is, after perl has finished running the program and just before the interpreter is being exited, even if it is exiting as a result of a die() function. (But not if it's morphing into another program via exec, or being blown out of the water by a signal--you have to trap that yourself (if you can).) You may have multiple END blocks within a file--they will execute in reverse order of definition; that is: last in, first out (LIFO). END blocks are not executed when you run perl with the -c switch, or if compilation fails.