Validate_box command is not working

vagrant@m103:/shared$ ls -ltr /shared
total 80972
-rwxrwxrwx 1 vagrant vagrant 5530388 Mar 5 2018 validate_lab_change_dbpath
-rwxrwxrwx 1 vagrant vagrant 5396138 Mar 5 2018 validate_lab_configuration_file
-rwxrwxrwx 1 vagrant vagrant 5530388 Mar 5 2018 validate_lab_different_logpath
-rwxrwxrwx 1 vagrant vagrant 5496553 Mar 5 2018 validate_lab_first_application_user
-rwxrwxrwx 1 vagrant vagrant 5409349 Mar 5 2018 validate_lab_first_sharded_cluster
-rwxrwxrwx 1 vagrant vagrant 5417755 Mar 5 2018 validate_lab_import_dataset
-rwxrwxrwx 1 vagrant vagrant 5488059 Mar 5 2018 validate_lab_initialize_local_replica_set
-rwxrwxrwx 1 vagrant vagrant 5396138 Mar 5 2018 validate_lab_launch_mongod
-rwxrwxrwx 1 vagrant vagrant 5479779 Mar 5 2018 validate_lab_remove_readd_node
-rwxrwxrwx 1 vagrant vagrant 7422102 Apr 25 2018 validate_lab_document_chunks
-rwxrwxrwx 1 vagrant vagrant 5379401 Feb 6 23:23 validate_lab_shard_collection
-rwxrwxrwx 1 vagrant vagrant 20966321 Feb 15 05:40 m103_validation.tgz
vagrant@m103:/shared$ validate_box
validate_box: command not found
vagrant@m103:/shared$ validate_box
validate_box: command not found
vagrant@m103:/shared$