What this snippet does
-a appends; without it -G replaces every supplementary group the user had.
Why practise typing this
Typing users & groups code builds muscle memory for the symbols and indentation Linux uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Linux practice
- Checking your identityUsers & Groups · beginner
- Creating a service accountUsers & Groups · intermediate
- Group changes need a new sessionUsers & Groups · intermediate
- Locking an accountUsers & Groups · beginner
- Running one command as another userUsers & Groups · intermediate
- su without a dash keeps your environmentUsers & Groups · intermediate