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Users and groups

Linux

Create user 

useradd  -s /bin/bash [user]
# 
adduser --shell /bin/false --ingroup {group} {new_login}

Delete user 

userdel [user]
# -r = remove home folder - NEVER DO IT !!!
# Were next cases:
#   1) /var/www stored in user home directory
#   2) /home/user has content of working www site

Lock/Unlock user 

# Lock user
usermod -L [user]
passwd -l [user]

# Unlock user
usermod -U [user]
passwd -u [user]

Add/Remove users to group 

# Add existing user to existing group
usermod -aG [group] [user]
# ... or
gpasswd -a [user] [group]

# Remove user from group
usermod -rG [group] [user]
# ... or
gpasswd -d [user] [group]

Change shell for user 

chsh -s [shell] [user]
# example
chsh -s /bin/bash mark

FreeBSD

Remove user 

pw userdel

Block/Unblock user 

pw lock
pw unlock

Groups 

# add
pw groupmod [group] -m [user]
# remove 
pw groupmod [group] -d [user]

Change shell for user 

pw usermod -s /bin/tcsh