在没有安装额外软件包的情况下获得以毫秒为单位的时间? [英] Get time in milliseconds without an installing an extra package?

问题描述

如何在不安装任何额外软件包的情况下在Perl中获得以毫秒为单位的时间?

How can I get the time in milliseconds in Perl without installing any extra package?

我正在运行Linux.

I am running Linux.

推荐答案

Time::HiRes已成为核心部分.要检查其可用性，请从命令行中检查Perl版本perl -v，或尝试将其与perl -e 'use Time::HiRes;'一起使用.

Time::HiRes has been part of the core since Perl 5.7.3. To check for its availability, check for the Perl version, perl -v, or try to use it with perl -e 'use Time::HiRes;', both from the command line.

样品用量:

use Time::HiRes qw/ time sleep /;

my $start = time;
sleep rand(10)/3;
my $end   = time;

print 'Slept for ', ( $end - $start ) , "\n";

要以Konerak的评论为基础，如果该评论不存在或无法使用，请通过反引号使用本机Linux命令:

To build on Konerak's comment, if it isn't there or it cannot be used, use native Linux commands via backticks:

sub time_since_epoch { return `date +%s.%N` }

print time_since_epoch;

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