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Adding a User in OSX on Command Line

Heavily based on answers to this question on serverfault.com.

List existing group IDs in numerical order to choose an unused one for new group :-

$ dscl . -list /Groups PrimaryGroupID | awk '{print $2}' | sort -n

Create the new group 'newgroup' and assign it an ID :-

$ sudo dscl . -create /Groups/newgroup
$ sudo dscl . -create /Groups/newgroup PrimaryGroupID 1000

View the new group :-

$ dscl . -read /Groups/newgroup
AppleMetaNodeLocation: /Local/Default
GeneratedUID: 423AF02C-F053-41E0-ABCD-33127EF9A9CA
PrimaryGroupID: 1000
RecordName: newgroup
RecordType: dsRecTypeStandard:Groups

List existing user IDs in numerical order to choose an unused one for new user :-

$ dscl . -list /Users UniqueID | awk '{print $2}' | sort -n

Create the new user 'newuser' and assign various attributes :-

$ sudo dscl . -create /Users/newuser
$ sudo dscl . -create /Users/newuser UserShell /bin/bash
$ sudo dscl . -create /Users/newuser RealName "New User"
$ sudo dscl . -create /Users/newuser UniqueID "1000"
$ sudo dscl . -create /Users/newuser PrimaryGroupID 1000

View the new user :-

$ dscl . -read /Users/newuser
AppleMetaNodeLocation: /Local/Default
GeneratedUID: 47D6D841-C7F1-4962-9F7E-167E8BFC3A91
PrimaryGroupID: 1000
RealName:
 Application
RecordName: newuser
RecordType: dsRecTypeStandard:Users
UniqueID: 1000
UserShell: /usr/bash
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