Understanding Linux File Permissions
Linux file permissions are fundamental to system security. This guide covers everything you need to know.
Permission Types
- r (read) - View file contents
- w (write) - Modify file contents
- x (execute) - Run as program
Using chmod
# Numeric method
chmod 755 file.sh # rwxr-xr-x
chmod 644 file.txt # rw-r--r--
# Symbolic method
chmod u+x file.sh # Add execute for user
chmod g-w file.txt # Remove write for group
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