Shulou(Shulou.com)06/02 Report--

A colleague asked me to help him locate, why his LINUX server many commands can not be used, prompt (command not found), and more deadly is a lot of system services, scripts can not run. Asked, what have you done before? He said what to do, but he added export PATH to the / etc/profile file and asked, how did you set it up? The answer is:

[root@localhost ~] # vim / etc/profile export PATH=/usr/lib/jenkins/ [root@localhost ~] # source / etc/profile

He said he simply added the default working directory for jenkins and then used source to make the configuration file take effect. In fact, that's exactly what the problem is!

PATH is the path of the system environment, and all commands and scripts of the system are searched according to the path of PATH. But if export PATH=/usr/lib/jenkins/, overwrites all the directories previously set by the system, such as (/ bin/; / sbin and other directories where system commands are stored) and becomes jenkins working commands, while ls, pwd, cd and other system commands can certainly not be found in the jenkins directory, as a result, all commands, scripts, and services will not run away, which is the main reason for this murder!

How to set up the real system PATH?

If it is a short-term setting:

Export PATH=$PATH:/usr/lib/jenkins/

If it is a long-term setting:

[root@localhost ~] # vim / etc/profile export PATH=$PATH:/usr/lib/jenkins/ [root@localhost ~] # source / etc/profile

In this way, a new search path is added to the original settings without overwriting the original PATH.

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