Linux 在不安装额外软件包的情况下以毫秒为单位获取时间？
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原文地址: http://stackoverflow.com/questions/7997819/
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Get time in milliseconds without an installing an extra package?
提问by JJ Liu
How can I get the time in milliseconds in Perl without installing any extra package?
如何在不安装任何额外包的情况下在 Perl 中获得以毫秒为单位的时间？
I am running Linux.
我正在运行 Linux。
采纳答案by Zaid
Time::HiReshas 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.
Time::HiRes自 Perl 5.7.3 以来一直是核心的一部分。要检查其可用性，请从命令行检查 Perl 版本perl -v，或尝试将其与 一起使用perl -e 'use Time::HiRes;'。
Sample usage:
示例用法：
use Time::HiRes qw/ time sleep /;
my $start = time;
sleep rand(10)/3;
my $end = time;
print 'Slept for ', ( $end - $start ) , "\n";
To build on Konerak's comment, if it isn't there or it cannot be used, use native Linux commands via backticks:
要建立在 Konerak 的评论之上，如果它不存在或无法使用，请通过反引号使用本机 Linux 命令：
sub time_since_epoch { return `date +%s.%N` }
print time_since_epoch;
