Printing message on the screen and also send to the syslog at the same time

Question

I'm trying to implement -s (i.e. silent) option in my script - when given the Errors/Info etc, will be send to the syslog otherwise printing on the screen and also sending to the syslog at the same time. That's what I'm doing:

echo -e "This Is a Test Message\nWell, not really!!"  2>&1 | logger

to send the echo message to the syslog (which doesn't print on-screen) but couldn't just figure out how to do the both at the same time. I see people only talk about either logging with syslog or sending log to a different file whilst printing on the screen but not the situation that I'm trying deal with. Any help or pointer would be greatly appreciated. Cheers!!

Answer 1

If you want to send the message to syslog and to stdout (not stderr), you can do this too:

echo -e "This Is a Test Message\nWell, not really!!" | tee >(exec logger)

And the efficient way to do it (if you're creating a function):

exec 40> >(exec logger)

function log {
    echo -e "$1"
    echo -e "$1" >&40
}

log "something..."

exec 40>&-  ## optionally close it at the end of the script.

That would save your script from calling external binary logger everytime you do an echo.

Answer 2

In that case, just echo the same message twice. You can do:

echo -e "This Is a Test Message\nWell, not really!!" | tee /dev/stderr | logger

But, it's actually simpler and more efficient to do:

error='This Is a Test Message\nWell, not really!!'
echo -e "$error" >&2
echo -e "$error" | logger

The >&2 sends the output to stderr, rather than stdout.

Answer 3

You can do:

echo -e "This Is a Test Message\nWell, not really!!" | logger -s

The manual page (man logger) states:

-s     Log the message to standard error, as well as the system log.