chmod 755 — what rwxr-xr-x means

755 rwxr-xr-x

The owner can read, write, and execute; the group and everyone else can read and execute but not modify.

Permission breakdown

When to use 755

The standard for directories and for executable scripts or binaries that others need to run but not change. Web server document roots and CLI tools usually sit at 755.

Set it with chmod

Apply this permission to a file:

chmod 755 filename

Or apply it recursively to a directory and everything inside it:

chmod -R 755 directory/

Other common permissions

Or build any permission with the interactive chmod calculator.