EUID和UID的区别？

Kamus_cu

EUID和UID，whoami who am i
的关系是什么？

briangao

UID (shown by /usr/ucb/whoami) and EUID -- effective UID (shown by who am i or id ) are  initially the same whenyou login to the system. When you su or run a setuid program, your EUID is changed.

For example:
You logged in as user susan(UID 517) and you su - bob (bob's UID is 900). Now your UID is 517 but EUID is 900

Same applies when you run a setuid program. Let's say you logged in as susan(UID 517) and you run a setuid program which is owned by root(UID 0). When you are executing the program, your UID is still 517 but EUID is 0.

Hope this helps

atu82

thanks

egg2003

第一句就写反了 whoami是显示euid

回复 2# briangao