my %flag;
..
$flag{'user'} = $user;
..
$flag{'uid'} = $uid;
...
...
return %flag; 

at the calling place use
my %userflags = buildCommand(..)
then access the values like $userflags{'user'}

or use references

return \%flag;

at the calling place use
my $userflags = buildCommand(..)
then access the values like $userflags->{'user'}