本文深入探讨了Unix/Linux系统中文件属性、进程属性及文件权限的概念，包括当前工作目录、环境变量、umask值等过程属性，以及真实用户ID、真实组ID、有效用户ID、有效组ID和附加用户ID、附加组ID等过程属性的详细解释。同时，文章还阐述了st_uid、st_gid属性与用户登录状态的关系。
About File attributes, process attributes and file permissions on Unix/Linux
system.
1. current working directory, environment variables, umask value are all
attributes of a process.
the real user ID, real group ID, effective user ID, effective group ID,
and supplymentary user ID and supplymentary group ID are attributes of a
process. The real user ID and group ID are ones who start the process(run the
program). The effective user ID and group ID usually equal to real user ID and
group ID. But if the set-user-ID bit of a file is set, the effective user ID and
group ID are forced to be the owner of the file and the group owner of the file.
2. st_uid, st_gid are attributes of a file, st_uid is owner of file, st_gid is
the group to which the file/use belong. st_uid and st_gid usually eaqual to the
use logging on and the group he/she belongs to. Both st_uid and st_gid can be
found in /etc/passwd file.
system.
1. current working directory, environment variables, umask value are all
attributes of a process.
the real user ID, real group ID, effective user ID, effective group ID,
and supplymentary user ID and supplymentary group ID are attributes of a
process. The real user ID and group ID are ones who start the process(run the
program). The effective user ID and group ID usually equal to real user ID and
group ID. But if the set-user-ID bit of a file is set, the effective user ID and
group ID are forced to be the owner of the file and the group owner of the file.
2. st_uid, st_gid are attributes of a file, st_uid is owner of file, st_gid is
the group to which the file/use belong. st_uid and st_gid usually eaqual to the
use logging on and the group he/she belongs to. Both st_uid and st_gid can be
found in /etc/passwd file.
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