在shell脚本中获取上个月最后一天的日期方法

$ date -d"`date +%Y%m01` last day" +%Y%m%d 
20161231 

#! /bin/sh 
nowdate=`date +%Y%m01` #本月第一天 
startdate=`date -d"$nowdate last month" +%Y%m%d` #上个月第一天 
enddate=`date -d"$nowdate last day" +%Y%m%d` #上个月最后一天 
#遍历上个月的每一天 
while (( $startdate <= $enddate )) 
do 
  echo $startdate 
  startdate=`date -d "+1 day $startdate" +%Y%m%d` 
done 

./getdate.sh 
20161201
20161202
20161203
20161204
20161205
20161206
20161207
20161208
20161209
20161210
20161211
20161212
20161213
20161214
20161215
20161216
20161217
20161218
20161219
20161220
20161221
20161222
20161223
20161224
20161225
20161226
20161227
20161228
20161229
20161230
20161231