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Create Group And User

make sure group or user to be created does not exist yet

id <group or user name>

create system group

sudo groupadd -r <group name>

create system user with specific login shell and group

sudo useradd -r -s /bin/false -g <group name> <user name>

print real and group and user id

id <group or user name>

extract group and user details from OS configuration for verification

cat /etc/group|grep <group name>
cat /etc/passwd|grep <group name>