root>useradd 1991 root>mkdir /home/1991 root>chown 1991.1991 /home/1991/ root>passwd 1991 Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully root>login 1991 Password: The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. $ root>deluser 1991 Removing user `1991' ... Warning: group `1991' has no more members. Done. root> root>ls Desktop root>cd /home/ root>ls 1991 jeffrin root>rm -r 1991/ root>cd root> root>useradd 471 root>mkdir /home/471 root>chown 471.471 /home/471/ root>ls -l /home/ total 8 drwxr-xr-x 2 471 471 4096 Apr 15 17:57 471 drwxr-xr-x 24 jeffrin jeffrin 4096 Apr 15 17:25 jeffrin root>chown +471:+471 /home/471/ root>ls -l /home/ total 8 drwxr-xr-x 2 471 471 4096 Apr 15 17:57 471 drwxr-xr-x 24 jeffrin jeffrin 4096 Apr 15 17:25 jeffrin root>chown +471 /home/471/ root>ls -l /home/ total 8 drwxr-xr-x 2 471 471 4096 Apr 15 17:57 471 drwxr-xr-x 24 jeffrin jeffrin 4096 Apr 15 17:25 jeffrin root>
https://www.gnu.org/software/coreutils/manual/coreutils.html#Disambiguating-names-and-IDs