Shell script implementation of the Gregorian calendar to the Chinese code share _linux shell

There is nothing to do, want to use the shell in Linux to write a Gregorian calendar to the lunar script, intermittent about one weeks finally finished. Now take it out and share it with you.

1. Why

This script implementation principle is look-up table method (because the formula has error), based on the Lunar New Year, the Lunar New year before and after two different lunar calendar calculation.

Before writing this script, you want to add the Gregorian and lunar dates to the Linux terminal command prompt. There are lunar software in Ubuntu to get the lunar date, but there is no similar software in Fedora or CentOS, so you want to do it yourself, but a lot of it is written in other languages, and it's not necessary to write it again. So I want to use the shell to write one.

2, function and use

Function: Converts specific Gregorian dates to lunar dates.

Time range: 1901~2099, corresponding to the lunar year time for 4598~4796

Parameter format (no parameter defaults to current system date): YYYYMMDD

As of January 1, 2013:

Copy Code code as follows:

$./lunar.sh 20130101
4709-11-20

3. Complete data

Full data download Link:
http://xiazai.jb51.net/201408/tools/lunar-20131202.7z

File in Package:

Lunar.sh The main script, specifically implement

datebases Lunar meta data

Change.log Change Log

Readme Script Description and Precautions

The main script lunar.sh code is as follows:

#!/bin/sh

DATE=$@
[ "$DATE" = "" ] && DATE=$(date +%Y%m%d)

databases_path=databases

date_year=$(echo $DATE |sed 's/^\(.\{4\}\).*/\1/')
date_month=$(echo $DATE |sed 's/.*\(..\)..$/\1/')
date_day=$(echo $DATE |sed 's/.*\(..\)$/\1/')
date_days=$(date -d $DATE +%j)

lunar_year=$(sed /$date_year/!d $databases_path |sed 's/^\(....\).*/\1/')

lunar_year_data=$(sed /$date_year/!d $databases_path |sed 's/.*\ \(.*\)/\1/')
lunar_year_data_bin=$(echo "ibase=16;obase=2;$lunar_year_data"|bc |sed -e :a -e 's/^.\{1,23\}$/0&/;ta')

new_year_month_bin=$(echo $lunar_year_data_bin |sed -e 's/^.\{17\}\(.\{2\}\).*/\1/')
new_year_month=$(echo "ibase=2;$new_year_month_bin"|bc |sed -e :a -e 's/^.\{1,1\}$/0&/;ta')

new_year_day_bin=$(echo $lunar_year_data_bin |sed -e 's/.*\(.\{5\}\)$/\1/')
new_year_day=$(echo "ibase=2;$new_year_day_bin"|bc |sed -e :a -e 's/^.\{1,1\}$/0&/;ta')

new_year_days=$(date -d $date_year$new_year_month$new_year_day +%j)
lunar_days=$(expr $date_days - $new_year_days + 1)

befor_or_after=0

if [ "$lunar_days" -le "0" ]; then
  befor_or_after=1
  date_year=$(($date_year - 1))

  lunar_year=$(sed /$date_year/!d $databases_path |sed 's/^\(....\).*/\1/')

  lunar_year_data=$(sed /$date_year/!d $databases_path |sed 's/.*\ \(.*\)/\1/')
  lunar_year_data_bin=$(echo "ibase=16;obase=2;$lunar_year_data"|bc |sed -e :a -e 's/^.\{1,23\}$/0&/;ta')
fi

lunar_leap_month_bin=$(echo $lunar_year_data_bin |sed -e 's/^\(.\{4\}\).*/\1/')
lunar_leap_month=$(echo "ibase=2;$lunar_leap_month_bin"|bc)

lunar_month_all_bin=$(echo $lunar_year_data_bin |sed -e 's/^.\{4\}\(.\{13\}\).*/\1/')
[ "$lunar_leap_month" = "0" ] && lunar_month_all_bin=$(echo $lunar_year_data_bin |sed -e 's/^.\{4\}\(.\{12\}\).*/\1/')
lunar_month_all=$(echo $lunar_month_all_bin |sed -e 's/0/29\ /g' |sed -e 's/1/30\ /g')

if [ "$befor_or_after" = "0" ];then
  lunar_month=1
  lunar_day=$lunar_days
  for i in $lunar_month_all
  do
   [ "$lunar_day" -gt "$i" ] && lunar_day=$(($lunar_day - $i)) && lunar_month=$(($lunar_month + 1))
   [ "$lunar_day" = "$i" ] && break
  done
else
  lunar_month=12
  lunar_day=$((-$lunar_days))
  lunar_month_all_bin=$(echo $lunar_month_all_bin |rev)
  lunar_month_all=$(echo $lunar_month_all_bin |sed -e 's/0/29\ /g' |sed -e 's/1/30\ /g')
  for i in $lunar_month_all
  do
   if [ "$lunar_day" -gt "$i" ]; then
     lunar_day=$(($lunar_day - $i))
     lunar_month=$(($lunar_month - 1))
   else
     lunar_day=$(($i - $lunar_day))
     break
   fi
  done
fi

if [ "$lunar_leap_month" = "0" ]; then
  echo $lunar_year-$lunar_month-$lunar_day
else
  if [ "$lunar_leap_month" -ge "$lunar_month" ]; then
   echo $lunar_year-$lunar_month-$lunar_day
  elif [ "$befor_or_after" = "0" ]; then
   if [ "$(($lunar_leap_month + 1))" = "$lunar_month" ];then
     lunar_month=$(($lunar_month - 1))
     echo $lunar_year-*$lunar_month-$lunar_day
   else
     lunar_month=$(($lunar_month - 1))
     echo $lunar_year-$lunar_month-$lunar_day
   fi
  else
   echo $lunar_year-$lunar_month-$lunar_day
  fi
fi

lunar.sh

4 Revision History

2013-12-02

Bug found: If the lunar calendar was semi-rotary last month, this month, the last month's 30 output was the first day of the month, because 30 days last month, which is just 30 last month, and this month is 29 days, 29<30, the next cycle of the month to reduce the number of days, so that last month's 30 for this month's first

Bug modification: Add a Judgment statement, if the remainder of the lunar calendar is equal to the number of days of the month will not cycle