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The script snippet looks garbled. It sounds like the wildcard in the pattern got expanded by the shell at some point. You need more double quotes where it happens :)

But aren't you making it too...

echo some_input | command <<HERE
but_so_is_this
HERE

Get it? Move the second input to the here-doc also.
Juha

logger -h host -P port. Have these options existed always ?

Juha

Beware, it likes to resize the field widths when there are large files.

Juha

kill -0 is often convenient, if checking when it went away. Works just as normal signals do, but does not
have any effect in the receiving process.

Juha

Can anyone condense it, having the KILL...

Third might be
$ content='echo $aa'
$ aa=hep
$ eval $content
hep
$ Juha

But an exit within content probably breaks things

I think the _exit(2) of the shell is sufficient, no need to explicitly unlock.

However... will you ever leave background processes ? The descriptor would be passed to them, and, depending on the...

I can't say anything about Linux, but in FreeBSD it would not be really hard.

You just have to tell devd (and possibly Xorg) to ignore that specific keyboard. If can do that, you are free to read...