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Linux Permission Denied: Causes and Fixes

Last reviewed: 9/14/2026

3 solutions

Exact Error Message

Permission denied or bash: script.sh: Permission denied

Quick Fix

Add execute permission: chmod +x script.sh or run with sudo if appropriate.

What This Error Means

Permission denied errors occur when Linux file system permissions prevent a user from performing an action. This is controlled by read, write, and execute permissions for owner, group, and others.

Common Symptoms

•Cannot execute scripts
•Cannot access files or directories
•Cannot modify files
•Installation or configuration failures

Common Causes

•File lacks execute permission
•User not in required group
•Directory lacks execute permission
•Ownership mismatch
•SELinux/AppArmor restrictions
•Root privilege required

Diagnostic Steps

1Check file permissions: ls -la filename
2Check current user: whoami
3Check group membership: groups
4Verify directory permissions
5Check for SELinux contexts: ls -Z

Solutions

Solution 1: Add execute permission

1Check current permissions
2Add execute permission to file
3Verify permission change
4Try executing the file again

Commands to Run

Execute permissions should be granted carefully for security

ls -la script.sh

chmod +x script.sh

ls -la script.sh

./script.sh

Solution 2: Change file ownership

1Identify correct owner and group
2Change ownership using chown
3Verify ownership change
4Test access

Commands to Run

Changing ownership can affect other users and processes

sudo chown user:group filename

sudo chown -R user:group directory/

Solution 3: Use sudo for administrative tasks

1Verify the command requires root privileges
2Use sudo to execute with elevated permissions
3Consider adding user to sudoers for persistent access
4Use sudo with caution

Commands to Run

sudo grants full system access - use carefully

sudo command

Avoid running applications as root when possible

sudo -i for root shell

Prevention Tips

✓Use principle of least privilege
✓Set appropriate umask for new files
✓Use groups for shared access
✓Document permission requirements
✓Regularly audit permissions

Version Notes: Applies to most Linux distributions (Ubuntu, CentOS, Debian, etc.)

Official Documentation

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