Issue running Ionic commands in PowerShell

When I try to run an ionic command in PowerShell I get an error that says

ionic : The term 'ionic' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:1 + ionic + ~~~~~ + CategoryInfo : ObjectNotFound: (ionic:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException

Does anyone know how I can fix this? Do I need to add a path variable to my environment variables?

I have installed node.js successfully and I believe have successfully installed Ionic and Cordova as well with the command "npm install -g ionic cordova"

The output from the "npm install -g ionic" is below

C:\Users\username\AppData\Roaming\npm\ionic -> C:\Users\username\AppData\Roaming\npm\node_modules\ionic\bin\ionic ionic@1.3.20 C:\Users\username\AppData\Roaming\npm\node_modules\ionic ├── proxy-middleware@0.7.0 ├── connect-livereload@0.5.2 ├── progress@1.1.7 ├── open@0.0.5 ├── colors@0.6.2 ├── ncp@0.4.2 ├── underscore@1.7.0 ├── crc@3.2.1 ├── async@0.9.0 ├── q@1.0.1 ├── semver@4.3.1 ├── shelljs@0.2.6 ├── cross-spawn@0.2.3 (lru-cache@2.5.0) ├── cli-table@0.3.1 (colors@1.0.3) ├── event-stream@3.0.20 (stream-combiner@0.0.4, duplexer@0.1.1, from@0.1.3, map-stream@0.0.5, pause-stream@0.0.11, split @0.2.10, through@2.3.6) ├── finalhandler@0.2.0 (escape-html@1.0.1, debug@2.0.0) ├── form-data@0.1.4 (mime@1.2.11, combined-stream@0.0.7) ├── optimist@0.6.0 (wordwrap@0.0.2, minimist@0.0.10) ├── connect@3.1.1 (utils-merge@1.0.0, parseurl@1.3.0, debug@1.0.4, finalhandler@0.1.0) ├── opbeat-ionic@1.1.3 (json-stringify-safe@5.0.0, console-log-level@1.0.0, stackman@0.2.2, after-all@2.0.1) ├── npm@2.1.3 ├── tiny-lr-fork@0.0.5 (debug@0.7.4, qs@0.5.6, faye-websocket@0.4.4, noptify@0.0.3) ├── serve-static@1.7.1 (escape-html@1.0.1, utils-merge@1.0.0, parseurl@1.3.0, send@0.10.1) ├── xml2js@0.4.4 (sax@0.6.1, xmlbuilder@2.6.2) ├── unzip@0.1.9 (setimmediate@1.0.2, readable-stream@1.0.33, pullstream@0.4.1, match-stream@0.0.2, binary@0.3.0, fstream @0.1.31) ├── prompt@0.2.12 (revalidator@0.1.8, pkginfo@0.3.0, read@1.0.5, winston@0.6.2, utile@0.2.1) ├── request@2.51.0 (json-stringify-safe@5.0.0, caseless@0.8.0, forever-agent@0.5.2, aws-sign2@0.5.0, stringstream@0.0.4, tunnel-agent@0.4.0, oauth-sign@0.5.0, node-uuid@1.4.3, qs@2.3.3, mime-types@1.0.2, combined-stream@0.0.7, tough-cookie@ 0.12.1, bl@0.9.4, http-signature@0.10.1, form-data@0.2.0, hawk@1.1.1) ├── vinyl-fs@0.3.7 (graceful-fs@3.0.6, lodash@2.4.1, strip-bom@1.0.0, vinyl@0.4.6, mkdirp@0.5.0, through2@0.6.3, glob-st ream@3.1.18, glob-watcher@0.0.6) ├── archiver@0.5.1 (lodash@2.4.1, readable-stream@1.1.13, lazystream@0.1.0, zip-stream@0.1.4, file-utils@0.1.5) └── gulp@3.8.8 (pretty-hrtime@0.2.2, interpret@0.3.10, deprecated@0.0.1, archy@0.0.2, minimist@1.1.1, semver@3.0.1, tild ify@1.0.0, chalk@0.5.1, orchestrator@0.3.7, gulp-util@3.0.4, liftoff@0.12.1)