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What does chmod 1777 mean?


What does chmod 1777 on a folder mean?
I know that chmod 777 means read/write/execute for everybody. What is the purpose of the additional '1'?


The 1 is the "stickc bit". If you perform an ls -l on that folder, you will see a 't' next to it.
The sticky bit 't' means:
'do not let anyone delete this folder or change it's permissions'

Generated 20:00:36 on Oct 27, 2020