Holiday Dates in BASH Shell

#get holidays with a BASH Shell Script and the calendar command

#holidays that don't fall on a set date
#list all holidays in a range (that month or more than one month
#Then grep for the holiday and cut
calendar -t 250301 -A90|grep "Easter Sunday"|head -n1|cut -d\* -f1
calendar -t 250601 -A30|grep Father|grep Sunday|cut -d\* -f1
calendar -t 220501 -A30|grep Mother|grep Sunday|cut -d\* -f1

#format it differently
date -d  "$(calendar -t 220501 -A30|grep Mother|grep Sunday|cut -d\* -f1) 2022" +%F        master 
2022-05-08

#If you don't have calendar on your system
#you can use ncal for some holidays
#example Father's day is the 3rd Sunday in June
ncal -m june 2025|grep "^Su"|awk '{print $4}'
#somthing like Easter might be a little more difficult