Simple bash terminal calendar

terminal_calendar.sh

#!/bin/bash

# Get current year and month
year=$(date +%Y)
month=$(date +%m)

# Print month and year
echo "$(date +%B\ %Y)"

# Print the days of the week
echo "Su Mo Tu We Th Fr Sa"

# Get the first day of the month
first_day=$(date -d "$year-$month-01" +%w)

# Create the calendar
for ((i=0; i<$first_day; i++)); do
    printf "   "
done
for ((day=1; day<=31; day++)); do
    if (( day < 10 )); then
        printf " "
    fi
    if (( day == $(date +%e) && month == $(date +%m) )); then
        printf "\e[7m%s\e[0m " $day
    else
        printf "%s " $day
    fi
    if (( $(($day+$first_day)) % 7 == 0 )); then
        printf "\n"
    fi
done
printf "\n"