How many values of powershell (cmdlet) are valid when unix shell is env, export, set, setenv?
create table table_14465871_1 (powershell__cmdlet_ varchar, unix_shell varchar, PRIMARY KEY (powershell__cmdlet_))
select count(powershell__cmdlet_) from table_14465871_1 where unix_shell = "env, export, set, setenv"