Really Helpful! Cheers!

There are multiple errors in the script ("repo" and "repo_name" variables are used interchangeably) for those who are getting errors, use this rectified version:

!/bin/sh

reponame=$1
token=yourapitokenhere

test -z $repo_name && echo "Repo name required." 1>&2 && exit 1

curl -H "Content-Type:application/json" http://your_domain_or_ip_here/api/v3/projects?private_token=$token -d "{ \"name\": \"$repo_name\" }"