Simple script for getting markdown files in a certain date range (assuming the files use a common Zettelkasten naming convention in which every file starts with YYYY-MM-DD).

get-entries-in-date-range.sh

#!/bin/bash

src=.
start=$1
end=$2

if [[ ! $start ]] && [[ ! $end ]]; then
  printf "Usage: ./tools/get-entries-in-date-range.sh [start string] [end string]\nEnd string is optional.\n\nExample: To get filenames that come after 2020-03 (anywhere in March) but before 2020-03-29 (assuming files follow this naming convention):\n./tools/get-entries-in-date-range.sh 2020-03 2020-03-29\n";
  exit 1;
fi

if [[ ! $end ]]; then
  end=9999-99-99
fi

for file in ${src}/*.md
  do
    filename="${file##*/}"
    if [[ "$filename" > "$start" ]] && [[ "$filename" < "$end" ]]; then
      echo "$filename"
    fi
  done