# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of the month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday;
# │ │ │ │ │                                   7 is also Sunday on some systems)
# │ │ │ │ │
# │ │ │ │ │
# * * * * * <command to execute>其中，每个字段格式：可以包含`逗号(,：表示离散点)`、`减号(-：表示时间段a-b)`。

0 0,10 * * * sh /path/to/job1.sh >/dev/null 2>&1
0 0-5 * * * sh /path/to/job2.sh >/dev/null 2>&1
0 1-2,5-10 * * * sh /path/to/job3.sh >/dev/null 2>&1
0 * * * * sh /path/to/job4.sh >/dev/null 2>&1
0 23 * * * sh /path/to/job5.sh >/dev/null 2>&1

$ get_cron 2
0 1-2,5-10 * * * sh /path/to/job3.sh >/dev/null 2>&1
0 * * * * sh /path/to/job4.sh >/dev/null 2>&1$ get_cron 2-11
0 0,10 * * * sh /path/to/job1.sh >/dev/null 2>&1
0 0-5 * * * sh /path/to/job2.sh >/dev/null 2>&1
0 1-2,5-10 * * * sh /path/to/job3.sh >/dev/null 2>&1
0 * * * * sh /path/to/job4.sh >/dev/null 2>&1

#!/usr/bin/env bash
########################################################################
# File Name: get_cron
# Author: 悟空的学习笔记
# Website: https://www.learnhard.cn
# Created Time: 2021年01月16日 星期六 17时21分01秒
########################################################################usage()
{cat <<END
usage:`basename $0` <start-hour> [end-hour]查找cron调度任务区间 [s,e)方法
END
}if [ "$#" -lt "1" ] ; thenusageexit 0
fis="$1"
e="$2"
if [ "$e" = "" ] ; thenlet e="$s+1"  # 取当前一小时内调度
fi# 查找调度区间 [s,e)
crontab -l | awk -v s=$s -v e=$e '!/^#|^$/{hours_field = $2# 每小时都执行if( hours_field !~/^[0-9]|*/)nextif (hours_field == "*") {print $0next}# 分离离散小时点n=split(hours_field ,hours_points , ",");for(i=1; i<=n;i++) {# 分离小时段m = split(hours_points[i] ,hours_line , "-");if(m <= 2) { # a-b or aa = hours_line[1]if( a >= s && a < e){##   ---s---a---b1---e---b2-->print $0;next}else if( m == 2){b = hours_line[2]##   --a--s----b---e--->if( b >= s && b < e) {print $0next}}}}
}'