Issue was a space before the ( bracer. Correct command is as below.
bosh -e 192.168.50.6 alias-env vbox --ca-cert <(bosh int vbox/creds.yml --path /director_ssl/ca) Using environment '192.168.50.6' as anonymous user
Name Bosh Lite Director UUID 575074fe-09db-4c88-8aae-eb8284b3d702 Version 263.2.0 (00000000) CPI warden_cpi Features compiled_package_cache: disabled config_server: disabled dns: disabled snapshots: disabled User (not logged in)
