🔐 Permissions

Linux permissions control who can read, write and execute files.

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🧩 Permission Types

r = read
w = write
x = execute

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🔧 Viewing Permissions

ls -l

Example:

-rw-r--r-- 1 user user 1200 file.txt

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🔧 Changing Permissions

chmod 644 file.txt
chmod 755 script.sh

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🔧 Changing Ownership

chown user:group file.txt

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🚨 Tips

• Never give 777
• Scripts need chmod +x
• Directories need x to enter