CTDP linux 程序员手册 (4.7) 调整时间的程序

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调整时间的程序:

datenow=`date +%m%d%Y`

month=`echo $datenow | cut -b1-2` 

day=`echo $datenow | cut -b3-4`

year=`echo $datenow | cut -b5-8`

echo $month-$day-$year:$1

days=30

adj=$1

while [ $adj -gt 0 ]

do

   case $month in

     04 | 06 | 09 | 11 | 4 | 6 | 9)

      days=`expr 30`

      ;;

     02 | 2)

      days=`expr 28`

      ;;

     * )

      days=`expr 31`

      ;;

   esac

   if [ $adj -ge $day ]; then

      if [ $month -gt 1 ]; then

#         month=`printf "%2d" $(expr $month - 1)`

    month=`expr $month - 1` 

      else

         year=`expr $year - 1`

         month=12

      fi

      if [ $adj -ge $days ]; then

         adj=`expr $adj - $days`

      else

    day1=$day

         day=`expr $days + $day - $adj`

         adj=0

      fi

   else

      day=`expr $day - $adj`

      adj=0

   fi

if [ `expr length $month` -lt 2 ]; then

 month=`echo 0$month`

fi

if [ `expr length $day` -lt 2 ]; then

 day=`echo 0$day`

fi

echo $month-$day-$year:$1:$adj

done

echo $month-$day-$year:$1:$adj

yy=`echo $year | cut -b3-4`

echo $month$day"0000"$yy

touch $month$day0000$yy /tmp/time.then

 

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