users
list User users;
cat etc/passwd
cut -d: -f1 /etc/passwd
list all users;
dscl . list /Users | grep -v '^_'
list all users;
dscacheutil -q user | grep -A 3 -B 2 -e uid:\ 5'[0-9][0-9]'
add user;
adduser bravo
add user (to sudo group, assign bash, and create home folder);
useradd elasticsearch -s /bin/bash -g sudo -m
add user to sudo group;
gpasswd -a bravo sudo
add group;
addgroup
delete user;
userdel userName
delete user and home directory;
userdel -r userName
force delete user;
userdel -f userName
remove user from group;
deluser userName groupName
change password (may need to use sudo -s or su -l);
passwd
change permissions of current user;
chown $USER -R
change permissions of user and group;
sudo chown -R userName:userGroup -R /path/to/folder