usermod
CautionModify a user
usermod -aG <group> <user>
Add groups with -aG (forgetting -a REPLACES all groups). -L locks, -U unlocks the account.
Examples
usermod -aG docker taroAdd to docker groupusermod -L taroLock the account
Syntax
usermod [-aG groups] [-L|-U] [-s shell] <user>
Before you run it
Omitting -a wipes existing group memberships.
The same reference, with no signal at all
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