如何从bash脚本运行NVM命令

Question

I want to run an NVM command from bash script ie nvm use 0.12.7 . So, I have written in bash file:

#!/bin/bash
. ~/.nvm/nvm.sh
nvm use 0.12.7

And then run the command in the terminal as sudo ./script.sh (script.sh is my bash file where above code is written). It gives me the result Now using node v0.12.7 . But when I check was the version activated or not, I found no affect. ie I ran command nvm ls and found the result as:

v0.12.0
v0.12.7

That's mean version 0.12.7 was not being activated. So, which things should I write in bash script as I can active node version from bash file.

Answer 1

One of the advantages of nvm is that you don't need to use sudo to install versions or to switch to another version. I'm not sure why you are using sudo in your nvm command.

The problem, as others have also said, is that the version is changed in a sub-shell. So the version in your "real" shell is not changed.

You can accomplish this by running your script with . (dot space) in front of it. That will make the script to be able to change stuff in your current shell.

This is my ~/bin/nvm-use-4 script:

. /usr/local/opt/nvm/nvm.sh
nvm use 4

And using it:

prawie:~$ nvm current
v0.10.29
prawie:~$ . nvm-use-4
Now using node v4.2.1
prawie:~$ nvm current
v4.2.1

If you are forced to use sudo here, I don't think it's possible to accomplish what you want, because the sudo'ed command is run in a sub-shell.

Unfortunately, you have not told use why you want to do this or what you want to accomplish. There could be better solutions to solve your problem. For example, if you want to always use a specific version of node.js when you open a new shell, you could add the following line to .profile , .bashrc or equivalent file:

nvm use 0.12.7