By -
cat /etc/passwd
lisa:x:501:501::/home/lisa:/bin/bash
x-password)
userID=501
groupID=501
:(commend): - not presented here
/home/lisa
- home directory

cat /etc/shadow - stores encrypted passwords
useradd -c "Peter Ivanov" pivanov

groupadd newgroup

cat /etc/group

usermod -G newgroup,projectX,progectY bob

groups bob

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