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Full Discussion: Reversing UID's
Top Forums UNIX for Dummies Questions & Answers Reversing UID's Post 66709 by dreaming1 on Wednesday 16th of March 2005 04:48:24 PM
Old 03-16-2005
Question Reversing UID's

Is it possible given a uid to determine information about the person with the uid? An example would be simple information regarding what group and the name of the person associated with that uid. It seems there is probably an easy staring me in the face but i cant seem to find it...
 

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PWCACHE(3)						   BSD Library Functions Manual 						PWCACHE(3)

NAME
pwcache -- cache password and group entries LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <pwd.h> char * user_from_uid(uid_t uid, int nouser); #include <grp.h> char * group_from_gid(gid_t gid, int nogroup); DESCRIPTION
The user_from_uid() function returns the user name associated with the argument uid. The user name is cached so that multiple calls with the same uid do not require additional calls to getpwuid(3). If there is no user associated with the uid, a pointer is returned to a string rep- resentation of the uid, unless the argument nouser is non-zero, in which case a NULL pointer is returned. The group_from_gid() function returns the group name associated with the argument gid. The group name is cached so that multiple calls with the same gid do not require additional calls to getgrgid(3). If there is no group associated with the gid, a pointer is returned to a string representation of the gid, unless the argument nogroup is non-zero, in which case a NULL pointer is returned. SEE ALSO
getgrgid(3), getpwuid(3) HISTORY
The user_from_uid() and group_from_gid() functions first appeared in 4.4BSD. BSD
June 9, 1993 BSD
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