我有一个自定义的shell脚本，每次用户登录时都会运行，或者假定身份，它被放置在/etc/profile.d中，并执行一些基本的env变量操作。 最近我添加了一些代码，以便如果屏幕正在运行，它将重新附加它，而不需要我输入任何内容。 但是有一些问题。 如果我以root身份登录，并且su - 给另一个用户，代码将再次运行。 当代码第一次运行时，是否有可以设置的变量来防止第二次运行代码？
我想写一些东西到磁盘上，但是如果我开始一个新的终端会话，我不想阻止代码运行。 这是有问题的代码。 它首先尝试重新附加 - 如果因为它已经连接（因为它可能在一个中间会话中）而不成功，它将'取回'该会话。
screen -r if [ -z "$STY" ]; then exec screen -dR fi最终，这个错误阻止了我将用户替换为另一个用户，因为只要我这样做，它就抓住了屏幕会话，并将我放回到开始的位置。 相当令人沮丧
I have a custom shell script that runs each time a user logs in or identity is assumed, its been placed in /etc/profile.d and performs some basic env variable operations. Recently I added some code so that if screen is running it will reattach it without needing me to type anything. There are some problems however. If I log-in as root, and su - to another user, the code runs a second time. Is there a variable I can set when the code runs the first time that will prevent a second run of the code?
I thought to write something to the disk but then I dont want to prevent the code from running if I begin a new terminal session. Here is the code in question. It first attempts to reattach - if unsuccessful because its already attached (as it might be on an interruped session) it will 'take' the session back.
screen -r if [ -z "$STY" ]; then exec screen -dR fiUltimately this bug prevents me from substituting user to another user because as soon as I do so, it grabs the screen session and puts me right back where I started. Pretty frustrating
最满意答案
你su得到的shell的$ {PPID}将是su命令。 所以输出
ps -o command= $PPID将以字母su开头，因此请为此进行测试。
The ${PPID} of the shell you get when you su will be the su command. So the output of
ps -o command= $PPIDwill begin with the letters su, so test for this.
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