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Fix ~/.ssh Permissions

Sets the only permissions OpenSSH accepts: 700 on the directory, 600 on private keys and config, 644 on public keys.

OpenSSH silently ignores a private key that other users could read, and falls back to password authentication without saying why. This is the single most common reason a correct key appears not to work.

When you need this: When the server keeps asking for a password even though the key is in place, or after copying keys from another machine or a backup.

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