On 9/22/2023 11:11 PM, Brian Inglis wrote:
On 2023-09-22 18:15, Allen, Norton T. via Cygwin wrote:
On 9/22/2023 8:07 AM, Brian Inglis via Cygwin wrote:
On 2023-09-21 23:58, Martin Wege via Cygwin wrote:
Does Cygwin have a shell (e.g. bash) API to lookup the Windows SID for
a given Cygwin user or group name?
/usr/bin/getent usersid thisisausername
Forget Windows! Think Unix:
$ getent passwd $USER # sanitized output:
$USER:*:$UID:545:U-$HOSTNAME/$USER,S-1-5-21-...-...-...-1001:$HOME:/bin/bash
According to the man page, getent passwd takes a numeric UID, not a
user name. But if you don't provide a UID, it basically lists what
would be in /etc/passwd, which you could parse to locate the row you
want by username.
[IIRC getent evolved from SunOS YellowPages/YP/NIS/+ facilities and
commands as LANs, sites, and orgs required more central control and
distribution than could easily be managed using text files
/etc/{hosts,protocols,services,networks,...}, while requiring
flexibility to allow some local setup and configurable priority
depending on system roles, provided by the Name Services Switch
/etc/nsswitch.conf.]
I checked all distro man pages I can find online and have locally, and
from SunOS and Solaris, key lookup and other features were supported
from the early days, while BSDs appear to use GNU (glibc) getent (or
at least its man page), as does Linux.
All data sources support lookup by non-numeric key get...nam....(3),
some by numeric key get...id(3), and some support enumeration
set...ent(3), get...ent(3), end...ent(3), e.g.
$ man getent
...
passwd When no key is provided, use
setpwent(3), getpwent(3), and endpwent(3)
to enumerate the passwd database.
When one or more key arguments are provided, pass each
numeric key to getpwuid(3) and each
nonnumeric key to getpwnam(3)
and display the result.
On Cygwin the key can also be a Windows SID.
...
Perhaps you were thinking of POSIX id(1p) which only takes a user
login name?
Sorry, you are entirely correct. I tried with my username and got
nothing. Then I remembered I have a different username on this system.
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