Permissions (file permissions)
File permissions are rules that control who can do what with a file or folder.
They determine whether someone can view a file, edit it, or share it with others. For example, you might share a document with a coworker but only let them read it, not change it. Permissions protect sensitive information by ensuring only authorized people can access or modify files.
Permissions (file permissions), explained at three levels
At home
Permissions are like rules for who can use your stuff. When you share a Google Doc, you get to decide whether your friend can only look at it or also make changes. If you share a photo album, you can choose whether people can add their own photos or just view yours. Permissions keep your files safe from accidental or unwanted changes.
At work
In the workplace, permissions are critical for security and collaboration. Managers might have full access to a project folder, team members can edit documents, and external clients can only view final deliverables. IT departments set permissions on shared drives and cloud storage to ensure sensitive data like financial records or personnel files are restricted to authorized staff.
At home
Permissions typically include read (view the file), write (modify the file), and execute (run the file as a program). On shared drives and cloud platforms, additional levels include commenting, sharing with others, and managing permissions. Files and folders inherit permissions from their parent directory by default, but this can be overridden for specific items.
At work
In professional environments, permissions are part of a broader access control strategy. Role-based access control (RBAC) assigns permissions based on job roles rather than individual users. The principle of least privilege dictates that users should only have the minimum access needed for their work. Permission audits help organizations identify and remediate overly broad access.
At home
At a technical level, Unix-style permissions use a numeric mode system (e.g., 755) or symbolic notation (rwxr-xr-x) assigning read, write, and execute for owner, group, and others. Windows NTFS uses discretionary access control lists (DACLs) with allow and deny entries for specific users and groups. Cloud platforms implement their own models: Google Drive uses role-based sharing (viewer, commenter, editor, owner), while SharePoint uses a site-permission inheritance hierarchy.
At work
Enterprise permission management involves integration with directory services like Active Directory or LDAP, automated provisioning and deprovisioning through identity governance platforms, and regular access certification reviews. Organizations implement data classification schemes that map permission levels to sensitivity labels, and deploy monitoring tools to detect permission misconfigurations or anomalous access patterns.
Real-world examples
At home
Aisha creates a shared photo album in Google Photos and invites her family. She sets her parents as viewers so they can see the photos but not accidentally delete any. She gives her sister editor access so they can both add new pictures.
At work
Carlos manages a company's shared drive and sets up permissions so the legal team has full access to the contracts folder, the sales team can read but not edit contracts, and interns cannot see the folder at all. This protects sensitive agreements from unauthorized changes.
Common confusions
- There's a widespread belief that sharing a link to a file means everyone can see it. The permissions on the link determine whether it is restricted to specific people, anyone with the link, or truly public.
- It's easy to assume only IT departments deal with permissions. Anyone who shares a file through Google Drive, OneDrive, or similar tools is setting permissions.
- Some people are convinced that a file is protected just because it is on a shared drive. If permissions are set too broadly, people who should not have access might still be able to view or edit it.
For analysts
Before you share any file, take a moment to think about what level of access the other person actually needs. If they just need to review something, give them view-only access. If they need to collaborate, give them edit access. And if you share a link, make sure it is restricted to specific people rather than open to 'anyone with the link'. That setting can accidentally expose files to unintended audiences. A quick check now prevents problems later.
History & origin
File permissions have been a core concept since the earliest multi-user operating systems in the 1960s and 1970s. Unix, introduced in 1969, established the owner-group-others permission model with read, write, and execute access levels that is still used in Linux and macOS today. Windows developed its own permission system using access control lists (ACLs) that allow more granular control. Cloud platforms later adapted these concepts for web-based file sharing.