Wednesday, July 09, 2014

Solaris remote public key authorization

Still a pain in Solaris 11. Openssh ssh-copy-id still does not work as expected so the process is manual unless you want to risk having multiple keys authorized for the same host remotely.

Thursday, July 03, 2014

On SMTP: RCPT To: command verb versus to: header

Ever wondered why you got an email with "to:" being some other address and not yours? Perhaps you got an email stating "to: Undisclosed recipients:;", why? you might have asked.

To simplify the explanation here the RCPT command using the verb “to:” is used to direct the email to a specific address. In the last mile the email will be received by the addressee but only the "to:" header if present will be accessible. If it is missing you get "to: Undisclosed recipients:;" and if it is set you get whatever it says. Clearly you can use a different email address there which will generate in some cases a heck of confusion ;-). You can confirm this yourself just by using telnet as usual for SMTP:

Tuesday, July 01, 2014

Variable syntax: cshell is picky. Use braces to refer to variables

If cshell (csh) is your default shell after you login ~/.cshrc will be parsed. If you get the error "variable syntax" your next step if to figure out what shell config file is declaring a variable incorrectly. The below is correct: Just remove the braces and you will end up with the "variable syntax" error.