Calculatrice Chmod - Grille d'autorisations de fichiers Linux
Au lieu de mémoriser les codes octaux, cochez Lire, écrire et exécuter pour le propriétaire, le groupe et le public : Dokall affiche instantanément la valeur octale, la notation symbolique et une commande chmod prête à coller.
Les préréglages courants incluent 755 pour les répertoires Web, 644 pour les fichiers, 600 pour les clés SSH et 400 pour les clés PEM en lecture seule. Modifiez le champ du nom de fichier pour personnaliser la commande du terminal avant de la copier.
Frequently Asked Questions
What is chmod?
chmod (change mode) is a Unix/Linux command that sets file permissions. It controls who can read, write, and execute a file - the owner, the group, and everyone else.
What do the numbers in chmod 755 mean?
Each digit represents permissions for owner, group, and others. 7 = read(4) + write(2) + execute(1). 5 = read(4) + execute(1). So 755 means owner has full access, group and others can read and execute but not write.
What is the difference between files and directories?
Execute permission on a file means it can be run as a program. Execute on a directory means you can cd into it and list its contents. Directory permissions 755 (rwxr-xr-x) are standard; file permissions 644 (rw-r--r--) are common for regular files.
What does chmod 777 do?
777 grants read, write, and execute to everyone - owner, group, and others. This is a security risk on servers because any user can modify the file. Use 755 for directories and 644 for files unless you have a specific reason for broader access.
Symbolic vs numeric notation?
Numeric (755) is compact and common in tutorials. Symbolic (u=rwx,g=rx,o=rx) is more readable and used in chmod commands with letters: chmod u+x file adds execute for the owner. Dokall converts between both formats.