Granular Permission Changes

Symbolic notation allows you to add or remove specific permissions without knowing the current state, using symbols for the affected parties and actions.

Symbolic Components

1. Who: u (user/owner), g (group), o (others), a (all: ugo).
2. Action: + (add permission), - (remove permission), = (set permission exactly).
3. Permission: r, w, x.

Examples

1. Add execute permission to the owner (user): bash $ chmod u+x my_script.sh

2. Remove write permission from the group and others: bash $ chmod go-w sensitive_file.txt

3. Set the permissions for everyone exactly to read-write: bash $ chmod a=rw private_data

Best Practice: Use Symbolic notation (u+x) when you want to make a small, precise change. Use Octal notation (755) when setting the permissions from scratch.