how to delay variable expansion?

[scandora]

Hello -

I have a bash script that uses "logger" to log messages. The way I am using it is:
MYNAME=$0
MYPID=$$
LOGGER="/usr/bin/logger -t $MYNAME[$MYPID]($LINENO) -p daemon.error"

...

echo 'some stuff' | $LOGGER

everything works properly, but the (built-in) $LINENO variable is expanded on the "LOGGER" line instead of the "echo" line.

How would I cause the $LINENO expansion to be delayed, or protected, until the echo command?

Thanks for your help!

[secondmouse]

I think changing LOGGER into a function should solve the problem:

#!/bin/bash
MYNAME=$0
MYPID=$$
function LOGGER {
    /usr/bin/logger -t "$MYNAME[$MYPID]($1)" -p daemon.error $2
}

LOGGER $LINENO "some stuff"

[scandora]

Thanks secondmouse, yes, that would solve the problem, although it would require an extra parameter on every line I want to log. I was thinking along the lines that some quoting, bracketing, eval or other magic could delay the expansion of the LINENO var (or all vars) until $LOGGER is actually executed. I am actively searching for an answer, I will post a solution when I find one. In the meantime, if you or anyone has any more ideas...

Thanks!

[secondmouse]

Scandora,
I am not sure it's worth trying to search for the exact solution that you wanted because if you do

echo 'some stuff' | $LOGGER

the part echo 'some stuff' does not carry LINENO info that'll be passed to $LOGGER even the line itself implies LINENO