Bash script to get list of all repos from GitHub organization and clone them in parallel. Requires bash, >=git-2.26, jq, parallel, find, sed. Also contains commented line for host substitution, in case you are using different hostname to utilize settings from .ssh/config

gh_repos.sh

#!/bin/bash

# Modified version of https://gist.github.com/caniszczyk/3856584#gistcomment-3157288
# Source https://gist.github.com/caniszczyk/3856584?permalink_comment_id=3335247#gistcomment-3335247

# Sample syntax:
#   foobar\.git
#   foobar\.git|helloworld\.git

# Bash strict mode
set -euo pipefail
IFS=$'\n\t'

IGNORED_REPO=""
IGNORED_REPO_COUNT=0

ORG=""

# per_page maxes out at 100
PER_PAGE=100

REPO_TYPE="all"

# https://github.com/settings/tokens
TOKEN=""

TEST_RUN=false

for ((PAGE=1; ; PAGE+=1)); do
  # Page 0 and 1 are the same
  # Change authorization method as needed
  INPUT=$(curl -H "Authorization: token $TOKEN" -s "https://api.github.com/orgs/$ORG/repos?type=$REPO_TYPE&per_page=$PER_PAGE&page=$PAGE" | jq -r ".[].ssh_url")

  if [[ -z "$INPUT" ]]; then
    echo "All repos processed, ignored $IGNORED_REPO_COUNT repo(s) and stopped at page=$PAGE"
    exit
  fi
  while read -r REPO_URL ; do
    if [[ "$REPO_URL" =~ $IGNORED_REPO ]]; then
      echo "*** IGNORING $REPO_URL"
      IGNORED_REPO_COUNT=$((IGNORED_REPO_COUNT+1))
    else
      # rewrite host in case you are using ssh config for different ssh key for your work account
      #REPO_URL=${REPO_URL/github.com/github.com-ds}
      if $TEST_RUN; then
        echo "git clone $REPO_URL"
      else
        #git clone "$REPO_URL" >/dev/null 2>&1 ||   # Pipe stdout and stderr to /dev/null
        #git clone --depth 1 "$REPO_URL" ||         # Shallow clone for faster cloning, within the repo use the following to get the full git history: git pull --unshallow
        git clone "$REPO_URL" ||                    # Vanilla
          { echo "ERROR: Unable to clone $REPO_URL!" ; continue ; }
      fi
    fi
# This syntax works as well /shrug
#  done <<< "$INPUT"
  done < <(echo "$INPUT")
done

# fetch all, try to merge current branch if straight forward
find . -type d -name ".git" |\
  sed 's/\/.git//g' |\
  parallel -j 16 --progress \
  "echo {}; git -C {} fetch --all; git -C {} merge --ff-only"