计算shell脚本的执行时间

ゝ一世哀愁。 2022-11-28 10:50 374阅读 0赞

# 一. 秒级别 #

#!/bin/bash
    
    start_time=`date --date='0 days ago' "+%Y-%m-%d %H:%M:%S"`
     
    #this is your shell script 
    sleep 1
     
    ##############
    finish_time=`date --date='0 days ago' "+%Y-%m-%d %H:%M:%S"`
     
    duration=$(($(($(date +%s -d "$finish_time")-$(date +%s -d "$start_time")))))
     
    echo "this shell script execution duration: $duration"

执行如下命令：

chmod +x time_s.sh
    ./time_s.sh

结果：

## ![20200817141621448.png][] ##

## 二.毫秒级别 ##

#!/bin/bash
    
    function timediff() {
    # time format:date +"%s.%N", such as 1502758855.907197692
        start_time=$1
        end_time=$2
    
        start_s=${start_time%.*}
        start_nanos=${start_time#*.}
        end_s=${end_time%.*}
        end_nanos=${end_time#*.}
    
        # end_nanos > start_nanos? 
        # Another way, the time part may start with 0, which means
        # it will be regarded as oct format, use "10#" to ensure
        # calculateing with decimal
    
        if [ "$end_nanos" -lt "$start_nanos" ];then
            end_s=$(( 10#$end_s - 1 ))
            end_nanos=$(( 10#$end_nanos + 10**9 ))
        fi
    
    # get timediff
        time=$(( 10#$end_s - 10#$start_s )).`printf "%03dn" $(( (10#$end_nanos - 10#$start_nanos)/10**6 ))`
        echo $time
    }
    
    start=$(date +"%s.%N")
    
    # Now exec some command
    sleep 1.2563
    
    end=$(date +"%s.%N")
    # here give the values
    
    #start=1502758855.907197692
    
    #end=1502758865.066894173
    
    
    timediff $start $end

执行如下命令：

chmod +x time_s.sh
    ./time_ms.sh

结果：

![20200817141807614.png][]

参考：

[https://blog.csdn.net/u010339879/article/details/75949076][https_blog.csdn.net_u010339879_article_details_75949076]

[https://www.lagou.com/lgeduarticle/2266.html][https_www.lagou.com_lgeduarticle_2266.html]

[https://blog.csdn.net/weixin\_34050427/article/details/85934782][https_blog.csdn.net_weixin_34050427_article_details_85934782]

[20200817141621448.png]: /images/20221124/27c38e3399114877bc9545977429759c.png
[20200817141807614.png]: /images/20221124/651d866990fa44619026d640a7865d03.png
[https_blog.csdn.net_u010339879_article_details_75949076]: https://blog.csdn.net/u010339879/article/details/75949076
[https_www.lagou.com_lgeduarticle_2266.html]: https://www.lagou.com/lgeduarticle/2266.html
[https_blog.csdn.net_weixin_34050427_article_details_85934782]: https://blog.csdn.net/weixin_34050427/article/details/85934782