su GitHub (downloading all repositories from a given user)

sugh.sh

#!/bin/bash

if [ -z "$1" ]; then
    echo "waiting for the following arguments: username + max-page-number"
    exit 1
else
    name=$1
fi

if [ -z "$2" ]; then 
    max=2
else
    max=$2
fi

cntx="users"
page=1

echo $name
echo $max
echo $cntx
echo $page

until (( $page -lt $max ))
do 
    curl "https://api.github.com/$cntx/$name/repos?page=$page&per_page=100" | grep -e 'clone_url*' | cut -d \" -f 4 | xargs -L1 git clone
    $page=$page+1
done

exit 0

Alternative Method:

Save following code in file clone.sh. Modify CNTX, NAME value and -u value to download private repositories.

CNTX={users|orgs}; NAME={username|orgname}; PAGE=1
curl -u {username|orgname} "https://api.github.com/$CNTX/$NAME/repos?page=$PAGE&per_page=100" |
  grep -e 'clone_url*' |
  cut -d \" -f 4 |
  xargs -L1 git clone

Run the script.

sh clone.sh