linux user management

how can you modify user id ?
------------------------------------
by using usermod command with help of u option/flag
ex:usermod -u 1500 u1
u1 user id =1500

how can you modify user login name ?
----------------------------------------------
usermod -l devops_engineer u1
usermod -l java_developer  u2
           new login name  old name

output:
--------
u1 user will become devops_enginner
u2 user will become java_developer 

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