This bash script helps downloading a whole subreddit wiki. Thanks to u/ThePixelHunter (https://www.reddit.com/user/ThePixelHunter/) for the original script adapted to work on Windows machine with added line 10.

download_subreddit_wiki.sh

#! /bin/bash
set -x
# Requires: bash coreutils curl jq

USER_AGENT='superagent/1.0'
EXPORTDIR="exports"

while read -r line; do
	SUBREDDIT="$line"
	SUBREDDIT=`echo $SUBREDDIT | sed 's/\\r//g'`

	while read -r line; do
	PAGE="$line" ; PAGE=$(echo $PAGE | sed 's|\/|\-\-|g')

	mkdir -p "./$EXPORTDIR/$SUBREDDIT/wiki/$PAGE"
	curl -s --user-agent "$USER_AGENT" "https://www.reddit.com/r/$SUBREDDIT/wiki/$PAGE.json" > "./$EXPORTDIR/$SUBREDDIT/wiki/$PAGE.json"
	printf "$SUBREDDIT/wiki/$PAGE   " ; echo $?
	jq -r '.data.content_md' "./$EXPORTDIR/$SUBREDDIT/wiki/$PAGE.json" > "./$EXPORTDIR/$SUBREDDIT/wiki/$PAGE.md"
	find . -type d -exec rmdir '{}' \; > /dev/null 2>&1

	done < <(curl -S --user-agent "$USER_AGENT" "https://www.reddit.com/r/$SUBREDDIT/wiki/pages.json" | jq -r '.data | .[]')

done < subreddits.list

• Original idea : https://www.reddit.com/r/DataHoarder/comments/ga2p8y/is_there_a_way_to_rip_an_entire_subreddit_wiki/
• Original script : https://www.reddit.com/user/ThePixelHunter/

Basic idea :

The Reddit API lets you fetch a subreddit's complete list of wiki pages: https://www.reddit.com/r/DataHoarder/wiki/pages.json
And you can fetch each page as a JSON object which includes both the rendered HTML and the original Markdown source: https://www.reddit.com/r/DataHoarder/wiki/zfs.json

Guide

It exports to a directory structure of each subreddit's wiki, leaving behind a json (raw API response) and markdown (raw wiki page text) file for each wiki page.

The script expects a subreddits.list file in the format:

DataHoarder
Homelab
DHExchange

...separated by unix newlines \n, not Windows newlines \r\n.

There's no error handling, and you'll definitely hit the API rate limits at some point.

Edit work on Windows with git-bash or WSL (Windows Subsystem for Linux) :

SUBREDDIT=echo $SUBREDDIT | sed 's/\\r//g'