Updated April 5, 2023
Introduction to Perl sleep
The Perl sleep() is one of the functions that can be used for to delay the execution of the script during the specified time intervals, and it must be supported with any formats like seconds, milliseconds, nanoseconds; it also called the other parameters, which is not specified in the script and returned with the same result as the output console if suppose we can use the expression in the script it has not been specified in the script as well as a return value of the time intervals will be calculated using the seconds the interruption may occur if the sleep function handled by some signal handlers with alarm notifications.
Syntax:
We already know that the Perl script has default keywords, variables and functions for performing the operations in Perl applications. Likewise, if we use the sleep() function like that, it can be handled by using the alarm notifications for calculating every time interval in the back end.
#! /usr/bin/perl
$var = values;
sleep(integer numbers);
----some perl script code logics depends upon the user requirements-----The above codes are the basic syntax for the Perl script using the sleep() function notifications in the application.
How sleep Function Work in Perl?
- Whenever the sleep function used in the script, it must be supported for the alarm notification for the mentioned time period. We can call the parameters by using the sleep function for both automatically and manually in the script. The expressions also used in the specific function for the needs, and it will be executed with each step in both compilation and runtime. So by using this sleep() it can be waked upon the particular time period it also been interrupted with the other signals like other function operations are executed their activity that time some disturbance has occurred so using sleep() function, it will be avoided.
- Like that, if the interruption occurs for sometime on the sleep() function, it will return the value with the time as seconds by using the “$!” operators in the Perl script. In comparison to the other functionality of the sleep(), the signals are used to allow the script to continue its operations without interruptions. It will used some set of signal handlers in the script are “SIGSTOP and SIGCONT” these handlers are allowed to perform the sleep function without any interruptions as well as it kills the other activity or functions, which is not performed in the script at that time.
Examples of Perl sleep
Given below are the examples of Perl sleep:
Example #1
Code:
#!/usr/local/bin/perl
sleep(rand(5));
print "\n";
if ($#vars != 5) {
print "Welcome To My Domain your files are padding now it can be starteds\n";
exit;
}
$vars1 = $vars[0];
$vars2 = $vars[1];
$vars3 = $vars[2];
for ($j=$vars2; $j <= $vars3; $j++) {
$n = $j;
if($j<13) { $n = "00$j"; }
elsif($j<113) { $n = "0$j"; }
eval {
local $SIG{ALRM} = sub { die "Hi User your padding started and once completed you have received the notification \n" };
sleep(3);
};
die $@ unless $@ eq "your padding files are in progress !\n";
$n1 = "mv $vars1$j $vars1$num";
print $n1."\n";
if(system($n1)) { print "Sorry user yoyr files are not padded please try again\n"; }
}Output:
In the above example, we used the sleep() function with different areas. We have to create and perform the padding operations in the mentioned files; the datas are stored in a temporary location in the script. Once it started the padding operations on the console, the datas and whatever user inputs values are pulled to the script operations. Here we used the sleep() function in two areas; one is starting we have mentioned sleep() with rand method this method is used to perform the operations in delay time as we mentioned in the sleep() method argument another one in the for loop for killing the padding operations if exists or else without the loop condition satisfied the sleep method will be evaluated with the predefined methods like $SIG with Alarm as the argument.
Example #2
Code:
#!/usr/local/bin/perl
sleep(3);
open(vars,"<Example.txt");
$vars1 = 2;
$vars2 = 3;
while($vars3 = <vars>) {
if ($vars3 =~ /^\d/ && $vars1) {
$vars4 = $vars3;
$vars1 = 4;
} elsif ($vars3 =~ /^\d/ && !$vars1) {
$vars5 = $vars3;
$vars1 = 5;
} elsif ($vars3 =~ /^\w-/) {
$vars6 = $vars3;
chop($vars6);
$vars4 =~ /(\d):(\h):(\m):(\s)/;
$vars7 = $1;
$vars8 = $2;
$vars9 = $3;
$vars10 = $4;
$vars11 = $vars7 * 2323 + $vars8 * 43 + $vars9 + $vars10 /24;
$vars5 =~ /(\d):(\h):(\m):(\s)/;
$vars12 = $1;
$vars13 = $2;
$vars14= $3;
$vars15 = $4;
$vars16 = $vars12 * 2323 + $vars13 * 43 + $vars14 + $vars15 / 24;
$vars17 = $vars16 - $vars11;
$output += $result;
printf("Welcome To My Domain \n $var6 = %.7f time seconds = %d frames\n", $result, $result * 24);
}
}
print "Have a Nice day user your net output is = ".($ouput / 48)." mins\n";
close vars;Output:
In the second example, we used the same sleep() method in the initial stage of the script, but we used the time frames in different formats like milliseconds, nanoseconds etc. When we used conditional statements in the script, it will debug, and the conditions are fully evaluated still, the loop is going to end. Like that we have calculated the time frame in days, hours, seconds it will be either milli or nanoseconds the net result of the output is to be 0, and the value is to be stored in the text file as we mentioned in the open(vars,<” Example.txt”>) method.
Example #3
Code:
#!/usr/bin/env perl
use strict;
use warnings;
my $a = 23;
my $b = 33;
my $c = 43;
my $d = 53;
print $a + $b , "\n";
sleep(3);
print $a - $b , "\n";
sleep(3);
print $c + $d , "\n";
sleep(3);
print $c - $d , "\n";
sleep(3);Output:
In the final example, we have performed mathematical operations like addition, subtraction of the variable values. In that, we can print the variables with some time intervals by using the sleep(3) operations. We can print all the variables with the 3 seconds at the regular time interval.
Conclusion
In Perl script, we used some utility methods for creating and performing the applications in a more sophisticated nature. Like that sleep() method will be used for the user operations with the system time alerts and their purposes it can be calculated and adjusted the clock at the time of operations which are performed by the user end.
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This is a guide to Perl sleep. Here we discuss the introduction, how sleep function work in Perl? Along with examples, respectively. You may also have a look at the following articles to learn more –
