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update openssl http://www.voidcn.com/article/p-afycxhtw-bpb.html install vsftpd https://www.liquidweb.com/kb/how-to-install-and-configure-vsftpd-on-centos-7/ fix vsftpd Fixing 500 OOPS: vsftpd: refusing to run with writable root inside chroot ()
https://gis.stackexchange.com/questions/142326/calculating-longitude-length-in-miles It doesn’t matter at what longitude you are. What matters is what latitude you are. Length of 1 degree of Longitude = cosine (latitude in decimal degrees) * length…
http://stackoverflow.com/questions/406294/left-join-and-left-outer-join-in-sql-server As per the documentation: FROM (Transact-SQL): <join_type> ::= } } ] JOIN The keyword OUTER is marked as optional (enclosed in square brackets), and what this means in this…
http://stackoverflow.com/questions/49925/what-is-the-difference-between-union-and-union-all UNION removes duplicate records (where all columns in the results are the same), UNION ALL does not. There is a performance hit when using UNION vs UNION ALL, since…
http://stackoverflow.com/questions/6244694/send-smtp-email-using-system-net-mail-via-exchange-online-office-365 MailMessage msg = new MailMessage(); msg.To.Add(new MailAddress("someone@somedomain.com", "SomeOne")); msg.From = new MailAddress("you@yourdomain.com", "You"); msg.Subject = "This is a Test Mail"; msg.Body = "This is a test message using Exchange…
http://stackoverflow.com/questions/3951722/whats-the-difference-between-unicode-and-utf8 This is an unfortunate misnaming perpetrated by Windows. Because Windows uses UTF-16LE encoding internally as the memory storage format for Unicode strings, it considers this to be the natural…
http://stackoverflow.com/questions/13257571/call-command-vs-start-with-wait-option For exe files, I suppose the differences are nearly unimportant. But to start an exe you don’t even need CALL. When starting another batch it’s a big difference, as…
http://stackoverflow.com/questions/20056727/need-to-understand-the-usage-of-semaphoreslim http://stackoverflow.com/questions/20904328/c-sharp-async-tasks-in-a-queue-or-waiting-list http://stackoverflow.com/questions/25691679/best-way-in-net-to-manage-queue-of-tasks-on-a-separate-single-thread To create an asynchronous single degree of parallelism queue of work you can simply create a SemaphoreSlim, initialized to one, and then have the enqueing method await…
http://stackoverflow.com/questions/14347038/dos-batch-why-are-my-set-commands-resulting-in-nothing-getting-stored You found the bbb (batch beginner bug), but not the variable is empty, it’s the expansion that doesn’t work as expected. Percent expansion is done when a line or…
Source: https://stackoverflow.com/questions/363884/what-does-the-symbol-do-in-powershell#574388 PowerShell will actually treat any comma-separated list as an array: “server1″,”server2” So the @ is optional in those cases. However, for associative arrays, the @ is required: @{“Key”=”Value”;”Key2″=”Value2″}…