使用文本和命令中使用？ [英] use text and use as command?

问题描述

我whant建立一个脚本来从一个命令文件中提取的话：

i whant to build a script to extract the word from a file in a command:

例如：
在我的文件我把我的用户名，我怎么可以导出的用户名不知道用户名作为我的命令，我这是命令的一部分：暂停这里应该二字出口

for example: in my file i keep my username , how can i export the username without knowing the username as part of my command , which my command is : suspend here should be the word exported?

从我的文件里面有里面的约翰的文字怎么能我告诉命令：暂停该用户名是JOHN

From my file which has the text inside "JOHN" how can i tell the command : suspend that the username is JOHN ?

我怎么能猫/ grep的/ sed的从文件中的文本作为命令的一部分：

how can i cat/grep/sed the text from the file as part of command :

像暂停|猫的文件，我有尝试，但暂停命令不拿用户名，所以应该有不同的东西。

something like suspend |cat file , i have try that but the suspend command does not take the username , so there should be something different .

我IDEEA哪里像这样

my ideea where like this

#!/bin/sh
username=cat my-file;

suspend $username ,

但我从来没有更迭，因为我的$的用户名不是从猫显示，猫是显示它但那一切在做什么。

but i had no succes , because my $username is not display from the cat , the cat is shows it but thats all that is doing.

推荐答案

使用下面的语法

  username=$(cat my-file)

您还可以使用反引号像

  username=`cat my-file`

但 $（ ... ）符号是preferable：它可以嵌套，是更具可读性。

but the $(...) notation is preferable: it can be nested and is more readable.

请阅读高级bash脚本编程指南（它会教你很多，即使它可以被批评）

Please read the Advanced Bash Scripting Guide (it will teach you a lot, even if it can be criticized)

您的使用中止是不正确的，我不明白你想用它做什么。什么会中止用户对你意味着什么？也许你想使用指派，或 pkill的（杀死该用户的所有进程，这是我的感觉是太苛刻了）...？

Your usage of suspend is incorrect, and I don't understand what you want to do with it. What would suspending a user mean to you? Perhaps you want to use pgrep or pkill (to kill all the processes of that user, which I feel is too harsh)...?

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