linux change user group code example

Example 1: add user to group

usermod -a -G examplegroup exampleusername

Example 2: linux add user to group

# Change the primary group a user is assigned to, note the -g here.
# When you use a lowercase g, you assign a primary group. When you 
# use an uppercase -G you assign a new secondary group.
usermod -g groupname username

Example 3: linux add user to group

# add user to additional group

usermod -G groupname username

Example 4: how to create a user and add it to a group in linux

useradd -G examplegroup exampleusername

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