chmod 775 explained (rwxrwxr-x)

chmod 775 sets the permissions to rwxrwxr-x.

• Owner: read, write, execute
• Group: read, write, execute
• Others: read, execute

When to use it

Shared project directories where a group of users all need to write.

Security note

Everyone else can still read and enter the directory. Combine it with a shared group and the setgid bit (chmod g+s) so new files keep the group.

Tip: applying it to files and directories separately

Directories need the execute bit to be entered, files usually do not. Set them separately: find dir -type d -exec chmod 755 {} + and find dir -type f -exec chmod 644 {} +.

Other common modes