usermod different from system to system

[Matt Hearn]

Hi! I'm trying to remove the secondary groups from various users. On some servers, this works:

usermod -G "" user

But on others, that gives me:
"Group does not exist
Group list specified with -G is invalid"

On those boxes I have to do:

usermod -g currentprimarygroup user

And it wipes out the secondaries. Why is this? Did something get patched, and I missed it? I'm not going to say that all of our systems are patched EXACTLY the same, but they should be pretty close. If someone knows what patch would have done this I can get it applied universally.

[Matt Hearn]

Ah, this is telling; a "what /usr/sbin/usermod" gives me different stuff:

/usr/sbin/usermod:
usermod.c $Date: 2006/02/27 07:01:41 $Revision: r11.11/16 PATCH_11.11 (PHCO_33142)
ugm_cmn.c $Date: 2006/02/27 07:01:46 $Revision: r11.11/18 PATCH_11.11 (PHCO_33142)
$Revision: jazz @ 20060228.07:57:57PST; jmkvw -proj integ -RW PHCO_33142 r11.11(R11.11_BL2006_0228_1) ;

/usr/sbin/usermod:
usermod.c $Date: 2008/06/25 01:52:11 $Revision: r11.11/18 PATCH_11.11 (PHCO_38492)
ugm_cmn.c $Date: 2008/06/25 01:44:07 $Revision: r11.11/20 PATCH_11.11 (PHCO_38492)
$Revision: jazz @ 20081106.00:28:37PST; jmkvw -proj integ -RW PHCO_38492 r11.11(R11.11_BL2008_1106_1) ;

[James R. Ferguson]

Hi Matt:

I would apply PHCO_38492 .

Regards!

...JRF...