Org Units

gam create org '<New OU Name>' parent '<Path/To/Parent/OU>'

gam delete org '<Path/To/OU>'

All the OUs

Without showing users

gam print orgs todrive

Minusercount

OUs with at least 1 user

gam print orgs minusercount 1

Maxusercount

With no users

gam print orgs maxusercount 0

FromParent

gam print orgs fromparent </Path/To/Top/OU> allfields todrive

Todrive

gam print usercountsbyorgunit todrive

With Advanced GAM here are the quoting rules for specifying OUs and how to deal with OUs with spaces in their names.

One OU

Use double quotes

ou "/Path/To/Sub OU"

ou_and_children "/Path/To/Sub OU"

Multiple OUs

Use double quotes around list, single quotes around each OU that contains a space although you can use single quotes even if the OU doesn't have a space

ous "'/Path/To/OU1 With Space','/Path/To/OU2 With Space'"

ous_and_children "'/Path/To/OU With Space',/Path/To/NoSpaceOU"