~/.ssh/id_rsa.pub Contains the public key for authentication. These files are not sensitive and can (but need not) be readable by anyone.~/.ssh/authorized_keys Lists the public keys (DSA/ECDSA/RSA) that can be used for logging in as this user. The format of this file is described in the sshd(8) manual page. This file is not highly sensitive, but the recommended permissions are read/write for the user, and not accessible by others.
[gaoxuan@AY140416102243006a45Z ~]$ pip helpUsage:pip <command> [options]Commands:install Install packages.uninstall Uninstall packages.freeze Output installed packages in requirements format.list List installed packages.show Show information about installed packages.search Search PyPI for packages.wheel Build wheels from your requirements.help Show help for commands.General Options:-h, --help Show help.--isolated Run pip in an isolated mode, ignoring environment variables and user configuration.-v, --verbose Give more output. Option is additive, and can be used up to 3 times.-V, --version Show version and exit.-q, --quiet Give less output.--log <path> Path to a verbose appending log.--proxy <proxy> Specify a proxy in the form [user:passwd@]proxy.server:port.--retries <retries> Maximum number of retries each connection should attempt (default 5 times).--timeout <sec> Set the socket timeout (default 15 seconds).--exists-action <action> Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup.--trusted-host <hostname> Mark this host as trusted, even though it does not have valid or any HTTPS.--cert <path> Path to alternate CA bundle.--client-cert <path> Path to SSL client certificate, a single file containing the private key and the certificate in PEM format.--cache-dir <dir> Store the cache data in <dir>.--no-cache-dir Disable the cache.--disable-pip-version-check Don't periodically check PyPI to determine whether a new version of pip is available for download. Implied with --no-index.