Variables needed:

export GITHUB_USER=git_username
export GITHUB_TOKEN=git_accesstoken

Script:

#!/bin/bash
 
function git_repo_transfer(){ 
  curl -vL \
    -u "$2:${GITHUB_TOKEN}" \
    -H "Content-Type: application/json" \
    -H "Accept: application/vnd.github.v3+json" \
    -X POST https://api.github.com/repos/$2/$1/transfer \
    -d '{"new_owner":"'$3'"}' \
    | jq .
}
 
repos=$( cat ./repos.txt) 
for repo in $repos; do (git_repo_transfer "$repo" "$1" "$2"); done

Script:

#!/bin/bash
 
temp=`basename $0`
TMPFILE=`mktemp /tmp/${temp}.XXXXXX` || exit 1
 
API_CALL="/user/repos?type=owner+fork=true"
 
function rest_call {
    curl -u $GITHUB_USER:$GITHUB_TOKEN -s $1 >> $TMPFILE
}
 
last_page=`curl -u $GITHUB_USER:$GITHUB_TOKEN -s -I "https://api.github.com$API_CALL" | grep '^Link:' | sed -e 's/^Link:.*page=//g' -e 's/>.*$//g'`
 
if [ -z "$last_page" ]; then
    rest_call "https://api.github.com$API_CALL"
else
    for p in `seq 1 $last_page`; do
        rest_call "https://api.github.com$API_CALL?page=$p"
    done
fi
 
cat $TMPFILE