Question 1

What does chmod 755 mean?

Accepted Answer

chmod 755 sets permissions to rwxr-xr-x: the owner can read, write, and execute; group members and others can read and execute but not write. It is the standard permission for scripts and executables that need to be run by anyone but modified only by the owner.

Question 2

What is the most secure permission for SSH private keys?

Accepted Answer

chmod 600 (rw-------): only the owner can read and write the file. SSH clients refuse to use private keys with permissions more open than this. Never set group or world read permissions on private keys.

Permission Panic

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