Arseniy's Lab

#! /bin/bash

currentYear=` date +"%Y"`   #текущий год
if(($# == 1))
then
  dmy=$currentYear
  strDay=$1
  strDay=${strDay,,}
else
  dmy=$1
  strDay=$2                 #день недели
  strDay=${strDay,,}
fi
num2=$dmy%4

case $strDay in
"mon") day=1;;
"tue") day=2;;
"wed") day=3;;
"thu") day=4;;
"fri") day=5;;
"sat") day=6;;
"sun") day=7;;
*) echo "Error. Uncorrect name of day of the week"
exit -1;;
esac

for((i=1; i<=12; i++))
do
  case $i in
  "1") dayNum=31;;
  "2") dayNum=28;;
  "3") dayNum=31;;
  "4") dayNum=30;;
  "5") dayNum=31;;
  "6") dayNum=30;;
  "7") dayNum=31;;
  "8") dayNum=31;;
  "9") dayNum=30;;
  "10") dayNum=31;;
  "11") dayNum=30;;
  "12") dayNum=31;;
esac
  num=`date -d $i/$dayNum/$dmy +"%u"`
  if((num == $day))
  then
    echo `date -d $i/$dayNum/$dmy +"%B"`
  fi
done