linux如何查看用户属于哪个组

[root@localhost xly]# id xly

uid=500(xly) gid=500(xly) groups=500(xly)

[root@localhost xly]# cat /etc/group

root:x:0:

bin:x:1:bin,daemon

daemon:x:2:bin,daemon

sys:x:3:bin,adm

adm:x:4:adm,daemon

tty:x:5:

disk:x:6:

lp:x:7:daemon

mem:x:8:

kmem:x:9:

xly:x:500:

cat /etc/group|grep