在ps o / p中错误地显示EGID和RGID？(EGID and RGID incorrectly displayed in ps o/p?)

我有这个：

$ ls -l test1.sh -rwxr-sr-x 1 root root 24 2011-05-31 13:27 test1.sh # sgid root $ id uid=1001(abc) gid=1001(abc) groups=4(adm),6(disk),20(dialout),21(fax),24(cdrom),26(tape),29(audio),30(dip),44(video),46(plugdev),104( fuse),106(lpadmin),112(netdev),121(admin),122(sambashare),1001(abc),1002(sbox)

但是，当我运行test1.sh时，我没有看到有效组所有者是ps o / p中的root ...为什么？

$ ps -o pid,ppid,cmd,euid,euser,ruid,ruser,egid,egroup,rgid,rgroup,nice,tty,user PID PPID CMD EUID EUSER RUID RUSER EGID EGROUP RGID RGROUP NI TT USER 8793 2349 bash 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc 8865 8793 /bin/bash ./test1.sh 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc 8866 8865 sleep 60 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc 8868 8793 ps -o pid,ppid,cmd,euid,eus 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc

I have this:

$ ls -l test1.sh -rwxr-sr-x 1 root root 24 2011-05-31 13:27 test1.sh # sgid root $ id uid=1001(abc) gid=1001(abc) groups=4(adm),6(disk),20(dialout),21(fax),24(cdrom),26(tape),29(audio),30(dip),44(video),46(plugdev),104( fuse),106(lpadmin),112(netdev),121(admin),122(sambashare),1001(abc),1002(sbox)

But, when I run test1.sh, I do not see the Effective Group Owner to be root in ps o/p.. why ?

$ ps -o pid,ppid,cmd,euid,euser,ruid,ruser,egid,egroup,rgid,rgroup,nice,tty,user PID PPID CMD EUID EUSER RUID RUSER EGID EGROUP RGID RGROUP NI TT USER 8793 2349 bash 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc 8865 8793 /bin/bash ./test1.sh 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc 8866 8865 sleep 60 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc 8868 8793 ps -o pid,ppid,cmd,euid,eus 1001 abc 1001 abc 1001 abc 1001 abc 0 pts/2 abc