https://manpages.ubuntu.com/manpages/focal/man2/setreuid.2.html
Ubuntu Manpage: setreuid, setregid - set real and/or effective user or group ID
set real and/or effective user or group ID
https://manpages.ubuntu.com/manpages/resolute/man2/setreuid.2.html
Ubuntu Manpage: setreuid, setregid - set real and/or effective user or group ID
set real and/or effective user or group ID
https://manpages.ubuntu.com/manpages/questing/de/man2/setregid.2.html
Ubuntu Manpage: setreuid, seteuid - reale und/oder effektive Benutzer- oder Gruppenkennung setzen
reale und/oder effektive Benutzer- oder Gruppenkennung setzen
ubuntumanpagereale
https://manpages.ubuntu.com/manpages/questing/man2/setregid32.2.html
Ubuntu Manpage: setreuid, setregid - set real and/or effective user or group ID
set real and/or effective user or group ID
https://www.man7.org/linux/man-pages/man2/setregid.2.html
setreuid(2) - Linux manual page
linuxmanual