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I am trying to install ionic globally.

sudo npm install -g cordova ionic AND npm install ionic@3.2.0 --save

I tried both the commend it execute successfully.

But when i run ionic info it shows -bash: ionic: command not found

Can anyone help me?

EDIT : Same thing happen when i install cordova

 sudo npm install -g cordova
Password:
/Users/hardik/.npm-packages/bin/cordova -> /Users/hardik/.npm-packages/lib/node_modules/cordova/bin/cordova
+ cordova@8.1.2
updated 1 package in 7.011s
Sshah-Mac-mini:node_modules sunny$ cordova -v
-bash: cordova: command not found

Terminal Log

 Sshah-Mac-mini:~ sunny$ npm list -g --depth=0
/Users/hardik/.npm-packages/lib
├── @angular/cli@7.3.5
├── cordova@8.1.2
├── ionic@4.11.0
└── npm@6.9.0

 Sshah-Mac-mini:~ sunny$ npm root -g
 /Users/hardik/.npm-packages/lib/node_modules


 ╭───────────────────────────────────────────────────────────────╮
 │ │
 │ New minor version of npm available! 6.7.0 → 6.9.0 │
 │ Changelog: https://github.com/npm/cli/releases/tag/v6.9.0 │
 │ Run npm install -g npm to update! │
 │ │
 ╰───────────────────────────────────────────────────────────────╯

 Sshah-Mac-mini:~ sunny$ npm install -g npm
 /Users/hardik/.npm-packages/bin/npm -> /Users/hardik/.npm-packages/lib/node_modules/npm/bin/npm-cli.js
 /Users/hardik/.npm-packages/bin/npx -> /Users/hardik/.npm-packages/lib/node_modules/npm/bin/npx-cli.js
 + npm@6.9.0
 updated 1 package in 16.501s
 Sshah-Mac-mini:~ sunny$ ionic info
 -bash: ionic: command not found
 Sshah-Mac-mini:~ sunny$

This command show globally available modules in npm

npm list -g --depth=0

if you cant see ionic cordova in this list it means both packages are not installed globally.

check your global installation path by

npm root -g

check if your ionic and cordova installed in this directory or not.
if you have tried path changing in first answer and still not working then uninstall node and install latest recommended version of node.

then install

npm install -g ionic
npm install -g cordova 

The first thing after the installation try this,

sudo ln -s /home/USER/npm/bin/ionic /usr/bin/ionic

If still getting the error, you are using Old version of Ionic Uninstall it and Reinstall it again.

> npm uninstall -g cordova

> npm uninstall -g ionic

Then just reinstall

> npm install -g cordova
> npm install -g ionic

if still, it gives errors another solution is
Go to user/.ionic folder and remove all files then install ionic again by using the following commands.

> npm install -g ionic

Fixed it

By editing ~/.bashrc with the following

export PATH=$PATH:/Users/EDIT_THIS_PUT_YOUR_USER_NAME_HERE/.npm-packages/bin