Create directories names for each month of a year

month-dirs.sh

# if using zsh you need to get the strftime function to be available
zmodload zsh/datetime

# We're using bash version 4 range expansion 
# to generate number of seconds between the 10th day of each month since unix epoch time `0` 
#  - we use the 10th day to miss months of unequal length
#  - we start from 0 seconds. Every year since 1970 has had the same number of months.
# We then pass those seconds to strftime to build our dirname 
# which is then used to create the directory
for seconds in {864000..31556952..2629746}
do 
  mkdir $(strftime %m-%B $seconds)
done

# add to .~/.profile as an alias
alias monthdirs='for seconds in {864000..31556952..2629746};do mkdir $(strftime %m-%B $seconds); done'