bash 如何暂时仅在bash脚本中设置PATH？
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How to set PATH only in bash script temporarily?
提问by akai
PATH can be set temporarily for following commands. Also, PATH can be set in a script, which remains permanently (in that terminal, or session). How can I set PATH that is globally effective in the script but not after the script finishes?
PATH 可以为以下命令临时设置。此外，PATH 可以在脚本中设置，该脚本永久保留（在该终端或会话中）。如何设置在脚本中全局有效但在脚本完成后无效的 PATH？
Example:
例子：
PATH=$PATH:/path1 path1 is valid only for this line
export PATH=$PATH:/path2
path2 is valid for this line
and this line too
I like it
exit
> path2 is still valid after the script finishes
> and when I type commands here manually
> I don't like it
回答by m47730
it's simply not true. If you write a script and change the $PATH variable, the change live only in the script:
这根本不是真的。如果您编写脚本并更改 $PATH 变量，则更改仅存在于脚本中：
vi test.sh
inside the file:
文件内：
#!/bin/bash
export PATH="$PATH:test"
let's test:
让我们测试一下：
echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/matteo/.local/bin:/home/matteo/bin:./bin:/home/matteo/.local/bin:/home/matteo/bin:./bin
chmod ug+x test
./test
echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/matteo/.local/bin:/home/matteo/bin:./bin:/home/matteo/.local/bin:/home/matteo/bin:./bin
same output. The change is effective only inside the script!
相同的输出。更改仅在脚本内部有效！
