取消设置单个命令的环境变量 [英] Unset an environment variable for a single command

问题描述

  FOO = bar somecommand 
  

如果我们想要为单个命令设置变量，该怎么办？

解决方案

技术上，直到某人导出为止，它们不是环境变量。但是你至少可以将它们设置为空：

  FOO =某些命令
  / pre> 
 
 
如果从环境中删除它们就足够了，可以使用 env ：
  env -u FOO somecommand 
  
 
In Bash, we can set an environment variable for a single command this way:
FOO=bar somecommand
What if we want to unset a variable for a single command?
解决方案
Technically, they're not environment variables until someone exports them.  But you can at least set them to empty:
FOO= some command
If removing them from the environment is enough, you can use env:
env -u FOO somecommand


                        
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