slack history exporter. override the three vars at the top. run the script for api token and dependency instructions. channels are public and have a # icon. private groups are private and have a lock icon.

slack-export.sh

#!/bin/bash

PRIVATE_GROUPS="thepit"
CHANNELS="avatar plm_website general health_insurance vim"
USERS="awilkie amonat bryanalves brittneysaint"

if [[ "$SLACK_TOKEN" == '' ]] ; then
  echo 'Visit https://api.slack.com/custom-integrations/legacy-tokens to make yourself a slack token'
  echo 'Set it with `export SLACK_TOKEN=abc123...`'
  echo 'Then rerun this script'
  exit 1
fi

which slack-history-export &>/dev/null || (echo "Install slack-history-export from npm" && exit 1)

mkdir -p slack_history


for chan in $CHANNELS ; do
  echo $chan
  slack-history-export --type group --token $SLACK_TOKEN -c $chan > "slack_history/$chan.json"
  sleep 3
done

for group in $PRIVATE_GROUPS ; do
  echo $group
  slack-history-export --type group --token $SLACK_TOKEN -g $group > "slack_history/$group.json"
  sleep 3
done

for user in $USERS ; do
  echo $user
  slack-history-export --type dm --token $SLACK_TOKEN -u $user > "slack_history/$user.json"
  sleep 3
done

ls -Rlh slack_history/