#!/bin/sh
CurYear=`date +%Y`
CurMonth=`date +%m`
CurDay=`date +%d`
GetYear= "$CurYear "
GetMonth= "$CurMonth "
GetDay= "`expr $CurDay - 1` "
if [ "$GetDay " -le 0 ] ; then
GetMonth=`expr $CurMonth - 1`
if [ "$GetMonth " -le 0 ] ; then
GetYear=`expr $CurYear - 1`
GetMonth=12
fi
case "$GetMonth "
in
1|3|5|7|8|10|12)
GetDay=31;;
4|6|9|11)
GetDay=30;;
2)
if [ `expr "$CurYear " % 400` -eq 0 ] ; then
GetDay=29
elif [ `expr "$CurYear " % 4` -eq 0 -a `expr "$CurYear " % 100` -ne 0 ] ; then
GetDay=29
else
GetDay=28
fi
esac
fi
if [ `echo "$GetMonth " | wc -m` -ne 3 ] ; then
GetMonth=0$GetMonth
fi
if [ `echo "$GetDay " | wc -m` -ne 3 ] ; then
GetDay=0$GetDay
fi
echo
echo " === Get Last Date === "
echo
echo "\t\t " "$GetYear " "$GetMonth " "$GetDay "
echo
方法二
date -d yesterday +%Y%m%d
方法三
DATE=`date +%Y%m%d -d "1 days ago"`
echo "$DATE"
shell脚本实现日期减一天
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转载自guying1028.iteye.com/blog/1600741
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