grep command to determine which uid's and gid's they are part of

$grep -o '^[^:]*' /etc/passwd |xargs -L1 id

uid=0(root) gid=0(root) groups=0(root)
uid=1(bin) gid=1(bin) groups=1(bin),2(daemon),3(sys)
uid=2(daemon) gid=2(daemon) groups=2(daemon),1(bin),4(adm),7(lp)
uid=3(adm) gid=4(adm) groups=4(adm),3(sys)
uid=4(lp) gid=7(lp) groups=7(lp)
uid=5(sync) gid=0(root) groups=0(root)
uid=8(mail) gid=12(mail) groups=12(mail)
uid=10(uucp) gid=14(uucp) groups=14(uucp)
uid=99(nobody) gid=99(nobody) groups=99(nobody)
uid=81(dbus) gid=81(dbus) groups=81(dbus)
uid=69(vcsa) gid=69(vcsa) groups=69(vcsa)
uid=32(rpc) gid=32(rpc) groups=32(rpc)
uid=173(abrt) gid=173(abrt) groups=173(abrt)
uid=38(ntp) gid=38(ntp) groups=38(ntp)
uid=499(saslauth) gid=76(saslauth) groups=76(saslauth)
uid=89(postfix) gid=89(postfix) groups=89(postfix),12(mail)
uid=68(haldaemon) gid=68(haldaemon) groups=68(haldaemon)
uid=74(sshd) gid=74(sshd) groups=74(sshd)
uid=72(tcpdump) gid=72(tcpdump) groups=72(tcpdump)
uid=16(oprofile) gid=16(oprofile) groups=16(oprofile)