В командной оболочке я хотел бы определить переменную месяца в if-statement, как показано ниже. Но я не могу определить переменную в if-statement - я продолжаю получать сообщение об ошибке, которое говорит «command» dmonth «not found». Любая помощь будет высоко ценится!Shell script: Определить переменную в if-statement
#Enter date:
echo "Enter close-out date of MONTHLY data (in the form mmdd): "
read usedate
echo " "
#Extract first two digits of "usedate" to get the month number:
dmonthn=${usedate:0:2}
echo "month number = ${dmonthn}"
echo " "
#Translate the numeric month identifier into first three letters of month:
if [ "$dmonthn" == "01" ]; then
dmonth = 'Jan'
elif [ "$dmonthn" == "02" ]; then
dmonth = "Feb"
elif [ "$dmonthn" == "03" ]; then
dmonth = "Mar"
elif [ "$dmonthn" == "04" ]; then
dmonth = "Apr"
elif [ "$dmonthn" == "05" ]; then
dmonth = "May"
elif [ "$dmonthn" == "06" ]; then
dmonth = "Jun"
elif [ "$dmonthn" == "07" ]; then
dmonth = "Jul"
elif [ "$dmonthn" == "08" ]; then
dmonth = "Aug"
elif [ "$dmonthn" == "09" ]; then
dmonth = "Sep"
elif [ "$dmonthn" == "10" ]; then
dmonth = "Oct"
elif [ "$dmonthn" == "11" ]; then
dmonth = "Nov"
else
dmonth = "Dec"
fi
echo dmonth