This is the documentation for CDH 4.7.1.
Documentation for other versions is available at Cloudera Documentation.

Accessing Table Information with the HCatalog Command-line API

# Create a table
$ hcat -e "create table groups(name string,placeholder string,id int) row format delimited fields terminated by ':' stored as textfile"

# Get the schema for a table
$ hcat -e "desc groups"
name	string	
placeholder	string	
id	int	

# Create another table
$ hcat -e "create table groupids(name string,id int)"

See the HCatalog documentation for information on using the HCatalog command-line application.