进程的pid，ppid，uid，euid，gid和egid有什么区别? [英] What is the difference between a Process' pid, ppid, uid, euid, gid and egid?

问题描述

上下文:我正在获取当前的Ruby进程ID.

Process.pid  #=> 95291

Process.ppid #=> 95201

Process.uid  #=> 501

Process.gid  #=> 20

Process.euid #=> 501

Process.egid #=> 20

推荐答案

顺序:

• pid:这是您在其中调用Process.pid方法的进程的进程ID(PID).
• ppid:父进程(产生当前进程的进程)的PID.例如，如果在bash shell中运行ruby test.rb，则该进程中的PPID将是Bash的PID.
• uid:进程正在其下运行的用户的UNIX ID.
• euid:进程正在其下运行的有效用户ID. EUID根据允许使用此UID的用户的操作来确定允许执行的程序.通常与uid相同，但是对于诸如sudo的命令可以有所不同.
• gid:程序在其下运行的UNIX组ID.
• egid:类似于euid，但用于组.

• pid: The is the process ID (PID) of the process you call the Process.pid method in.
• ppid: The PID of the parent process (the process that spawned the current one). For example, if you run ruby test.rb in a bash shell, PPID in that process would be the PID of Bash.
• uid: The UNIX ID of the user the process is running under.
• euid: The effective user ID that the process is running under. The EUID determines what a program is allowed to do, based on what the user with this UID is allowed to do. Typically the same as uid, but can be different with commands like sudo.
• gid: The UNIX group ID the program is running under.
• egid: Like euid, but for groups.

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