Where is "groupadd" command?

[unforgiven]

hi,
when i try to use groupadd command, it gaves me
/bin/sh: groupadd: not found

  what should i do? i want to install mysql, and i think i need this command

[bmarkus]

Use 'addgroup'

[unforgiven]

thanks, i use that, but still have a problem
for installing mysql i should write these command:

groupdadd mysql  => i use addgroup mysql
useradd -g mysql mysql  => i use adduser -g mysql mysql

but it gaves me:
adduser: group name 'mysql' is in use

what is deffrence between adduser and useradd??  i can't undrestand!

[bmarkus]

Try

adduser -G mysql mysql