user/password management

tested on a Kali Linux machine. 
root@kali:~# uname -a Linux kali 3.18.0-kali3-amd64 #1 SMP Debian 3.18.6-1~kali2 (2015-03-02) x86_64 GNU/Linux 
root@mmp:~# passwd -e sofi passwd: password expiry information changed. root@mmp:~# passwd -S sofi 
sofi P 01/01/1970 0 99999 7 -1                                                                                                                                     










adding GROUP.

root@mmp:~# groupadd 26mag
root@mmp:~# grep 26mag /etc/group
26mag:x:1002:

adding users to GROUP.

root@mmp:~# id akira
uid=1000(akira) gid=1000(akira) groups=1000(akira),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),112(lpadmin),113(sambashare)
root@mmp:~# usermod -g 26mag akira
root@mmp:~# id akira
uid=1000(akira) gid=1002(26mag) groups=1002(26mag),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),112(lpadmin),113(sambashare)