On 03/12/2025 15:20, Marco Atzeri via Cygwin wrote:
On 03/12/2025 13:50, Roland Mainz via Cygwin wrote:
On Wed, Dec 3, 2025 at 12:57 PM Marco Atzeri via Cygwin
<[email protected]> wrote:
I am probably missing something, but this seems bizarre (to me)
$ id
uid=197608(Marco) gid=197121(NESSUNO) groups=197121(NESSUNO),114(Account
locale e membro del gruppo Administrators),544(Administrators),547(Power
Users),545(Users),4(INTERACTIVE),66049(ACCESSO CONSOLE),11(Authenticated
Users),15(Questa organizzazione),113(Account
locale),4095(CurrentSession),66048(LOCALE),262154(Autenticazione
NTLM),405504(Livello obbligatorio alto)
$ newgrp 545 touch prova2
newgrp: group '545' does not exist
$ uname -svr
CYGWIN_NT-10.0-26200 3.6.5-1.x86_64 2025-10-09 17:21 UTC
Please use the group name ("Users" in your case) and not the numeric GID.
If you really need to use the numeric gid, then you can use $ getent
group 545 | awk -F ':' '{ print $1 } ' # to convert it to a group name
(see comment below about localised Windows builtin group names), and
then plug that into newgrp:
$ newgrp "$(getent group 545 | awk -F ':' '{ print $1 } ')" touch
prova2 #
BTW: There is one issue with this: Windows builtin account names
(users+groups) can be localised, e.g. English gid=545 is "Users",
while in German it's "Benutzer".
as usual PEBCAK
Actually, I think this is a shortcoming of the cygwin version of newgrp.
The SUS description [1] of newgrp allows a numeric group id to be specified.
(In fact, it includes the clarifying remark "If group is a non-negative
numeric string and exists in the group database as a group name, the
numeric group ID associated with that group name will be used as the
group ID", which suggests a, um, straightforward implementation)
But it seems that our implementation only currently handles a group name
(See [2]).
[1] https://pubs.opengroup.org/onlinepubs/7908799/xcu/newgrp.html
[2] https://cygwin.com/cgit/newlib-cygwin/tree/winsup/utils/newgrp.c#n166
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