Shell Programming and Scripting

A20130924.0000-0005_file1
A20130924.0000-0005_file2
A20130924.0005-0010_file1
A20130924.0005-0010_file2
.
.
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A20130924.2355-0000_file1
A20130924.2355-0000_file2

#Function to get yesterday's date
get_one_day_before_date()
{
day=$1
month=$2
year=$3
if [ $day -eq 01 ]; then
        if [ $month -eq 01 ]; then
        month=12
        year=`expr $year - 1`
        else
                month=`expr $month - 1`
        if  [ $month -lt 10 ]; then
                month="0$month"
        fi
        fi
                day=`cal $month $year | awk 'NF != 0{ last = $0 }; END{ print last }' |  awk '{ print $NF }'`
          else
                        day=`expr $day - 1`
                        if  [ $day -lt 10 ]; then
                                day="0$day"
                        fi
        fi
                 yr=`echo $year`
                 echo $year$month$day
}

#get previous day's date
DD=`date +%d`
MM=`date +%m`
YY=`date +%Y`
prev_date=`get_one_day_before_date $DD $MM $YY`

if [ $# -eq 1 ]
then    # Use given argument as copy date:
        copy_date="$1"
else    # Use yesterday as copy date:
        copy_date=$(get_one_day_before_date $(date '+%d %m %Y') )
fi
# Copy selected files to target directory:
cp A$copy_date.*_file[12] /test/copied