{"id":309,"date":"2026-05-03T17:32:29","date_gmt":"2026-05-03T15:32:29","guid":{"rendered":"https:\/\/eryann.fr\/?p=309"},"modified":"2026-05-03T17:32:30","modified_gmt":"2026-05-03T15:32:30","slug":"fiche-gestion-des-utilisateurs-et-des-groupes-sous-debian-ubuntu","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/linux\/fiche-gestion-des-utilisateurs-et-des-groupes-sous-debian-ubuntu\/","title":{"rendered":"Fiche gestion des utilisateurs et des groupes sous debian \/ ubuntu"},"content":{"rendered":"\n<p>La gestion des utilisateurs et des groupes est une base essentielle de l\u2019administration syst\u00e8me Linux.<br>Elle permet de contr\u00f4ler l\u2019acc\u00e8s aux ressources et d\u2019appliquer des politiques de s\u00e9curit\u00e9.<\/p>\n\n\n\n<p>Objectifs :<\/p>\n\n\n\n<p>&#8211; cr\u00e9er et g\u00e9rer des utilisateurs<br>&#8211; cr\u00e9er et g\u00e9rer des groupes<br>&#8211; attribuer des droits<br>&#8211; comprendre les fichiers syst\u00e8me li\u00e9s<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"1024\" src=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/9ca29561-768a-4829-b682-f92fb63b9e5e-683x1024.png\" alt=\"\" class=\"wp-image-310\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/9ca29561-768a-4829-b682-f92fb63b9e5e-683x1024.png 683w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/9ca29561-768a-4829-b682-f92fb63b9e5e-200x300.png 200w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/9ca29561-768a-4829-b682-f92fb63b9e5e-768x1152.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/9ca29561-768a-4829-b682-f92fb63b9e5e.png 1024w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fichiers importants<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/passwd   : informations utilisateurs<br>\/etc\/shadow   : mots de passe chiffr\u00e9s<br>\/etc\/group    : groupes<br>\/etc\/gshadow  : mots de passe groupes<br>\/home\/        : r\u00e9pertoires utilisateurs<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Cr\u00e9ation d\u2019un utilisateur<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>adduser user1<\/code><\/pre>\n\n\n\n<p>Ce que fait la commande :<\/p>\n\n\n\n<p>&#8211; cr\u00e9e l\u2019utilisateur<br>&#8211; cr\u00e9e le r\u00e9pertoire \/home\/user1<br>&#8211; cr\u00e9e le groupe user1<br>&#8211; demande un mot de passe<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Suppression d\u2019un utilisateur<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>deluser user1<\/code><\/pre>\n\n\n\n<p>Supprimer avec son dossier :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>deluser --remove-home user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Modifier un utilisateur<\/h2>\n\n\n\n<p>Changer le mot de passe :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>passwd user1<\/code><\/pre>\n\n\n\n<p>Modifier le shell :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>usermod -s \/bin\/bash user1<\/code><\/pre>\n\n\n\n<p>Changer le r\u00e9pertoire personnel :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>usermod -d \/home\/newdir user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Lister les utilisateurs<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>cut -d: -f1 \/etc\/passwd<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Cr\u00e9ation d\u2019un groupe<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>groupadd groupe1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Suppression d\u2019un groupe<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>groupdel groupe1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ajouter un utilisateur \u00e0 un groupe<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>usermod -aG groupe1 user1<\/code><\/pre>\n\n\n\n<p>V\u00e9rifier :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>groups user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Retirer un utilisateur d\u2019un groupe<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>gpasswd -d user1 groupe1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Groupes primaires et secondaires<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>- groupe primaire : groupe principal de l\u2019utilisateur<br>- groupes secondaires : groupes suppl\u00e9mentaires<\/code><\/pre>\n\n\n\n<p>Changer le groupe principal :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>usermod -g groupe1 user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Gestion des droits fichiers<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Voir les permissions<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ls -l<\/code><\/pre>\n\n\n\n<p>Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-rw-r--r-- 1 user1 groupe1 fichier.txt<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Modifier les permissions<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>chmod 644 fichier.txt<br>chmod 755 dossier<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Modifier le propri\u00e9taire<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>chown user1:groupe1 fichier.txt<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Structure des permissions<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>r = lecture (4)<br>w = \u00e9criture (2)<br>x = ex\u00e9cution (1)<\/code><\/pre>\n\n\n\n<p>Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>chmod 755 \u2192 rwxr-xr-x<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Droits sp\u00e9ciaux<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">SUID<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>chmod u+s fichier<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">SGID<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>chmod g+s dossier<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Sticky bit<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>chmod +t dossier<\/code><\/pre>\n\n\n\n<p>Utilisation typique :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/tmp \u2192 sticky bit activ\u00e9<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Gestion des comptes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Verrouiller un utilisateur<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>passwd -l user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">D\u00e9verrouiller<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>passwd -u user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Expiration du compte<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>chage -l user1<\/code><\/pre>\n\n\n\n<p>Modifier :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>chage user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Utilisateur sudo<\/h2>\n\n\n\n<p>Ajouter un utilisateur aux droits administrateur :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>usermod -aG sudo user1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rification<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>id user1<\/code><\/pre>\n\n\n\n<p>Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>uid=1001(user1) gid=1001(user1) groups=1001(user1),27(sudo)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Bonnes pratiques<\/h2>\n\n\n\n<p>&#8211; utiliser un compte par utilisateur<br>&#8211; \u00e9viter d\u2019utiliser root directement<br>&#8211; limiter les droits au strict n\u00e9cessaire<br>&#8211; utiliser les groupes pour g\u00e9rer les acc\u00e8s<br>&#8211; v\u00e9rifier r\u00e9guli\u00e8rement les comptes<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Probl\u00e8mes fr\u00e9quents<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Probl\u00e8me<\/th><th>Cause<\/th><th>Solution<\/th><\/tr><\/thead><tbody><tr><td>Permission denied<\/td><td>droits insuffisants<\/td><td>v\u00e9rifier chmod\/chown<\/td><\/tr><tr><td>Commande refus\u00e9e<\/td><td>pas dans sudo<\/td><td>ajouter au groupe sudo<\/td><\/tr><tr><td>Acc\u00e8s fichier refus\u00e9<\/td><td>mauvais groupe<\/td><td>v\u00e9rifier groups<\/td><\/tr><tr><td>utilisateur bloqu\u00e9<\/td><td>compte verrouill\u00e9<\/td><td>passwd -u<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c0 retenir<\/h2>\n\n\n\n<p>La gestion des utilisateurs et des groupes est essentielle pour s\u00e9curiser un syst\u00e8me Linux.<br>Elle permet de contr\u00f4ler les acc\u00e8s et d\u2019organiser les droits efficacement.<\/p>\n\n\n\n<p><audio autoplay=\"\"><\/audio><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La gestion des utilisateurs et des groupes est une base essentielle de l\u2019administration syst\u00e8me Linux.Elle permet de contr\u00f4ler l\u2019acc\u00e8s aux ressources et d\u2019appliquer des politiques de s\u00e9curit\u00e9. 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