Download all files from a Slack workspace export folder.

slack-files-downloader.sh

#!/bin/bash 
#
# This script will browse a Slack export folder and download all files in a new /export folder
# 
# HOW TO:
# 1. As a Workspace admin, download an export of your Slack history (https://www.slack.com/services/export) 
# 2. Make sure you have jq installed (https://stedolan.github.io/jq/)
# 3. Place this file at the root of your Slack export folder, next to channels.json
# 4. Run `bash slack-files-downloader.sh` in your terminal
#
# OPTIONS
# -o Overwrite files if they already exist in destination folder, otherwise skip them.
# -s Do not show message when a file is skipped


while getopts "os" flag
do
    case $flag in
        o) overwrite=true;;
        s) silent=true;;
    esac
done

printf "\nSelect one specific file type to download or leave empty for any (e.g. mp3, binary, jpg, png):\n"
read usertype

printf "\nSelect a channel to look into or leave empty for all channels:\n"
read userchannel

for channel in $(cat channels.json | jq -rc '.[].name')
do
	if [[ $channel == $userchannel ]] || [[ -z $userchannel ]]
	then
		printf "\n============================================\nLooking into #$channel...\n============================================\n"

		for file in "$channel"/*.json
		do
			for a in $(cat $file | jq -c '.[].files[0] | [.title, .url_private_download, .filetype] | del(..|nulls)' | sed 's/ //g')
			do
				filetype=$(echo $a | jq -r '.[2]')

				if [[ $filetype == $usertype ]] || [[ -z $usertype ]] || [[ -z $filetype ]]
				then
					filename_raw=$(echo $a | jq -r '.[0]')
					
					filename=$(echo $filename_raw | sed -e 'y/āáǎàçēéěèīíǐìōóǒòūúǔùǖǘǚǜüĀÁǍÀĒÉĚÈĪÍǏÌŌÓǑÒŪÚǓÙǕǗǙǛÜ/aaaaceeeeiiiioooouuuuuuuuuAAAAEEEEIIIIOOOOUUUUUUUUU/')
					filename="${filename##*/}"
					
					if [[ ! -z $filename_raw  ]] && [[ $filename_raw != "null"  ]] 
					then
						
						if [ -f "export/$channel/$filename" ] && [[ $overwrite != true ]]
						then
							if [[ $silent != true ]]
							then
								printf "$filename already exists in destination folder. Skipping!\n"
							fi
							continue
						fi
						
						printf "Downloading $filename...\n"
							
						mkdir -p export/$channel

						url=$(echo $a | jq -rc '.[1]')
						
						curl --progress-bar $url -o "export/$channel/$filename"
					fi
				fi
			done
		done
	fi
done

Thanks!
Works like a charm

This iteration will rename files if the same name exist

while getopts "os" flag
do
case $flag in
o) overwrite=true;;
s) silent=true;;
esac
done

printf "\nSelect one specific file type to download or leave empty for any (e.g. mp3, binary, jpg, png):\n"
read usertype

printf "\nSelect a channel to look into or leave empty for all channels:\n"
read userchannel

for channel in $(cat channels.json | jq -rc '.[].name')
do
if [[ $channel == $userchannel ]] || [[ -z $userchannel ]]
then
printf "\n============================================\nLooking into #$channel...\n============================================\n"

    for file in "$channel"/*.json
    do
        for a in $(cat $file | jq -c '.[].files[0] | [.title, .url_private_download, .filetype] | del(..|nulls)' | sed 's/ //g')
        do
            filetype=$(echo $a | jq -r '.[2]')

            if [[ $filetype == $usertype ]] || [[ -z $usertype ]] || [[ -z $filetype ]]
            then
                filename_raw=$(echo $a | jq -r '.[0]')
                
                filename=$(echo $filename_raw | sed -e 'y/āáǎàçēéěèīíǐìōóǒòūúǔùǖǘǚǜüĀÁǍÀĒÉĚÈĪÍǏÌŌÓǑÒŪÚǓÙǕǗǙǛÜ/aaaaceeeeiiiioooouuuuuuuuuAAAAEEEEIIIIOOOOUUUUUUUUU/')
                filename="${filename##*/}"
                
                if [[ ! -z $filename_raw ]] && [[ $filename_raw != "null" ]]
                then
                    if [ -f "export/$channel/$filename" ] && [[ $overwrite != true ]]
                    then
                        base="${filename%.*}"
                        extension="${filename##*.}"
                        counter=1
                        new_filename="${base}$(printf "%04d" $counter).${extension}"

                        while [ -f "export/$channel/$new_filename" ]; do
                            counter=$((counter + 1))
                            new_filename="${base}$(printf "%04d" $counter).${extension}"
                        done

                        filename=$new_filename
                    fi

                    printf "Downloading $filename...\n"
                    
                    mkdir -p "export/$channel"

                    url=$(echo $a | jq -rc '.[1]')
                    
                    curl --progress-bar $url -o "export/$channel/$filename"
                fi
            fi
        done
    done
fi

done