How do I use chmod to change file permissions?

How do I use chmod to change file permissions?

You can use the chmod command followed by the permission settings and the file name. For example, chmod 755 filename.

What do the numbers in chmod mean?

The numbers represent permissions for the owner, group, and others. For example, 7 means read, write, and execute.

Can I use letters instead of numbers?

Yes, you can use letters like 'r' for read, 'w' for write, and 'x' for execute. For example, chmod u+x filename adds execute permission for the user.

What happens if I set permissions to 777?

Setting permissions to 777 gives read, write, and execute permissions to everyone, which can be a security risk.