This PR is related to this issue. Annoyingly there are multiple versions of mailx out there, with different options available. The version used in this script uses the -a option add a header, but the version I have installed (Heirloom mailx) uses -a to add an attachment, and there is no good way to set a header. This StackExchange answer summarizes the situation and options.
The PR looks for the version of mailx installed with mailx -V, which on my system outputs just 12.5 7/5/10 and nothing more. On a different system that outputs
mailx (GNU Mailutils) 3.5
Copyright (C) 2007-2017 Free Software Foundation, inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
There could be a better way to detect these versions of mailx, but this felt safe in that it looks for that one particular string and only does something different if it's present. Otherwise, it should behave the same as current script. This will need to be updated if this version of mailx is updated to 12.6, but updates don't seem to happen very often there.
If this incompatible version of mailx is found, then we use sendmail instead. From what I found, there is no good way to send HTML emails with the other version of mailx, and many people suggest just using sendmail instead.
…talled
This PR is related to this issue. Annoyingly there are multiple versions of
mailxout there, with different options available. The version used in this script uses the-aoption add a header, but the version I have installed (Heirloom mailx) uses-ato add an attachment, and there is no good way to set a header. This StackExchange answer summarizes the situation and options.The PR looks for the version of
mailxinstalled withmailx -V, which on my system outputs just12.5 7/5/10and nothing more. On a different system that outputsThere could be a better way to detect these versions of
mailx, but this felt safe in that it looks for that one particular string and only does something different if it's present. Otherwise, it should behave the same as current script. This will need to be updated if this version ofmailxis updated to12.6, but updates don't seem to happen very often there.If this incompatible version of
mailxis found, then we usesendmailinstead. From what I found, there is no good way to send HTML emails with the other version ofmailx, and many people suggest just usingsendmailinstead.