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73 lines
2.9 KiB
Markdown
Linux FAQs with Answers--How to change PATH environment variable on Linux
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> **Question**: When I try to run an executable, it complains "command not found." The executable is actually located in /usr/local/bin. How can I add /usr/local/bin to my PATH variable, so that I can run the command without specify the path?
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In Linux, PATH environment variable stores a set of directories to search for an executable command when the command is typed by a user. The value of PATH variable is formatted as a series of colon-separated absolute paths. Each user has a user-specific PATH environment variable (initialized with system-wide default PATH variable).
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To check the current PATH environment variable of a user, run the following command as the user:
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$ echo $PATH
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/usr/lib64/qt-3.3/bin:/bin:/usr/bin:/usr/sbin:/sbin:/home/xmodulo/bin
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Alternatively, run:
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$ env | grep PATH
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PATH=/usr/lib64/qt-3.3/bin:/bin:/usr/bin:/usr/sbin:/sbin:/home/xmodulo/bin
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If the command that you type is not found in any of these directories, the shell will throw an error message: "command not found"
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If you want to add an additional directory (e.g., /usr/local/bin) to your PATH variable, you can follow these instructions.
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### Change PATH Environment Variable for a Particular User Only ###
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If you want to temporarily add a new directory (e.g., /usr/local/bin) to a user's default search path in the current login session, you can simply type the following.
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$ PATH=$PATH:/usr/local/bin
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Now check if PATH has been updated:
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$ echo $PATH
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/usr/lib64/qt-3.3/bin:/bin:/usr/bin:/usr/sbin:/sbin:/home/xmodulo/bin:/usr/local/bin
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The updated PATH will then remain effective in the current login session. The change, however, will be lost in any new terminal session.
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If you want to change PATH variable permanently, open ~/.bashrc (or ~/.bash_profile) with a text editor, and append the following line.
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export PATH=$PATH:/usr/local/bin
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Then activate the change permanently by running:
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$ source ~/.bashrc (or source ~/.bash_profile)
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### Change PATH Environment Variable System-wide ###
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If you want to permanently add /usr/local/bin to system-wide default PATH variable, edit /etc/profile as follows.
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$ sudo vi /etc/profile
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export PATH=$PATH:/usr/local/bin
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Once you re-login, the updated PATH variable will take effect.
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/change-path-environment-variable-linux.html
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作者：[Dan Nanni][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni |