The command cannot be used in linux

Problem analysis:

The occurrence of this problem indicates that there is a problem with your /etc/profile configuration, usually because there is a problem with the path configuration. Eliminate errors in the added content, then restart a new window and execute the source /etc/profile command to solve the problem.

When all commands cannot be used, vi will also lose its function. At this time, you need to use the absolute path of the shell command to call the command.

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The specific method is as follows:

# 编辑profile文件 /usr/bin/vim /etc/profile

Then execute the following command in a new window:

source /etc/profile

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