"I was a bit challenged when I was younger to stay on the right path" - Dwayne Johnson
Such wisdom. Not all path leads to happiness. The wrong
PATH will lead you to unhappiness. Here we will learn the right path and stay in it!
There are many things you can learn about path. I think the two important ones are:
- Finding your path
- Updating your paths.
In mac, you can find path from command line by typing
echo $PATH. Mine looks something like this:
echo $PATH /Users/iggy/.nvm/versions/node/v10.15.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
Path is colon (
:) separated and it reads from left to right.
For example, if I execute
node, my terminal would first search node executable at (
/Users/iggy/.nvm/versions/node/v10.15.1/bin), then (
/usr/local/bin), etc. If node was not found anywhere, it will return
command not found: node.
To find which path node currently uses, run
which node, in my case, I see:
Note the similarities between my one of my paths and node path:
#PATH /Users/iggy/.nvm/versions/node/v10.15.1/bin #node path /Users/iggy/.nvm/versions/node/v10.15.1/bin/node
You can either prepend or append your path
This type of change is temporary. It will disappear when the terminal is closed. To make it permanent, update path inside
Suppose you are an evil person and wanted to modify the
node command of your coworker so when they run
node, they are running your script instead. All you need is to prepend your own path so when they run
node, path will execute your node executable first. Here is how you can do it:
/for-fun dir, inside create a file named
node. Make sure to add
#!/bin/bash (shebang) on first line:
#!/bin/bash echo "ALL YOUR FILES ARE GONE *EVIL LAUGHS*"
Save, then grant permission
chmod +x ./node. Adding shebang and permission are required so they can run
node directly instead of
Users/iggy/for-fun with whatever path you used. You can use
pwd if you're not sure where you're at)
Check your newly appended path (
echo $PATH) to make sure our prepend path is the first path displayed. Check also your node path (
which node) - you should see the updated path.
Cool! Next time someone runs
node, they'll see:
node ALL YOUR FILES ARE GONE *EVIL LAUGHS*
That's all folks. Happy hacking!!