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This may be because you are using single quotes in the here document. Try double quotes.


What do you see it doing if you add a set -x on the second line? The trace should show the commands...

I also noticed the command substitution around the message declaration (message=$(...)), but it's SH and the OS isn't mentioned, so I don't know if that's significant.

It is significant.

The subshell call message=$("this is my message $var whatever $othervar") will fail with command not found error.

There is also an issue with subshell call, which will not...