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unix commande passwd.md

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+up::[[unix commandes d'identification]]
+title::"comamdne pour modifier des mots de passe"
+#informatique/unix
+
+----
+Sans argument : change le mot de passe de l'utilisateur actuel
+```bash
+$ passwd
+changing password for "pierre"
+pierre's Old pasword: xxxxx
+pierre's New password: xxxxxxx
+Enter the new password again : xxxxxxx
+```
+
+> [!note]
+> modifie le fichier [[unix fichier etc-shadow|/etc/shadow]]
+
+> [!definition] Usage
+> ```
+>  passwd [-i infosystem] -l location]] [-u authname] [name]
+>   infosystem:
+>     file
+>     NIS
+>     OpenDirectory
+>     PAM
+>   location (for infosystem):
+>     file           location is path to file (default is /etc/master.passwd)
+>     NIS            location is NIS domain name
+>     OpenDirectory  location is directory node name
+>     PAM            location is not used
+> ```