Shell Programming and Scripting

#! /bin/bash

YEAR=`echo $1 | cut -c 1-4`
MONTH=`echo $1 | cut -c 5-6`
DAY=`echo $1 | cut -c 7-8`

for i in 1 2 3 4 5 6 7
do
        dayofweek=`cal $MONTH $YEAR | awk '$i == $DAY {printf("%s","$i")}'`

        echo $dayofweek
done

#!/bin/sh
echo $(( $(date -d "$1" +%w ) + 1 ))

#! /bin/bash 

YEAR=`echo $1 | cut -c 1-4`
MONTH=`echo $1 | cut -c 5-6`
DAY=`echo $1 | cut -c 7-8`

for i in 1 2 3 4 5 6 7
do        dayofweek=`cal $MONTH $YEAR | awk -v day=$DAY -v tarRow=$i '$tarRow == day {print($tarRow)}'`

        if [ "$dayofweek" != "" ];
        then

                echo $i
                break;
        fi
done

date +%A

#!/bin/bash

YEAR=${1:0:4}
MONTH=${1:4:2}
DAY=${1:6:2}

set Sunday Monday Tuesday Wednesday Thursday Friday Saturday
eval echo \$$(cal $MONTH $YEAR | awk -v d=${DAY#0} 'match($0, "(^| )"d"( |$)") {print int(RSTART/3+1)}')