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Harvard moves classes online

Harvard tells students don't return after spring break because of Coronavirus.

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Fixed WSL sshd: no hostkeys available -- exiting

Encountered:  $  sudo service ssh --full-restart  * Stopping OpenBSD Secure Shell server sshd                                                                     [ OK ]  * Starting OpenBSD Secure Shell server sshd                                                                            sshd: no hostkeys available -- exiting. Run ssh-keygen -A In the /etc/ssh/ folder, and then restart the server by: $  sudo service ssh --full-restart  * Stopping OpenBSD Secure Shell server sshd                                                                     [ OK ]  * Starting OpenBSD Secure Shell server sshd                                                                     [ OK ]
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PowerMTA pmta command

Usage: pmta [options] command where 'options' are:     --help                display this message     --xml                 display result in XML     --dom                 display result as DOM-like "variables" and where 'command' is one of:     clear dnscache domainname     check mfrom [--tcp] [--dumppackets] mfrom ip     check spf [--tcp] [--dumppackets] ip heloDomain [mailFrom]     delete [--dsn] [--queue=domain[/vmta]] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--older-than=time-interval] [--no-accounting]     deregister [--user=name] [--local-only] [--retain-unloaded]     disable source [--reenable-after=interval] ip domain[/vmta]     enable source ip domain[/vmta]     list [--queue=domain[/vmta]] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--maxitems=n] [--older-than=time-interval] [--pause] [--priority] [--schedule]     pause queue domain[/vmta]     pause job jobid     register [--user=name] [--label=name] [--webmon-ip=ip] [--webm
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How to fix: mv: failed to preserve ownership

mv  is the wrong tool for this job; you want  cp  and then  rm . Since you're moving the file to another filesystem this is exactly what  mv  is doing behind the scenes anyway, except that  mv  is also trying to preserve file permission bits and owner/group information. This is because  mv  would preserve that information if it were moving a file within the same filesystem and  mv  tries to behave the same way in both situations. Since you don't care about the preservation of file permission bits and owner/group information, don't use that tool. Use  cp --no-preserve=mode  and  rm  instead. But if you don't care about the warning, mv actually does move the files before complaining  ownership problem.
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