Cron job stderr to email AND log file?

Question

I have a cron job:

$SP_s/StartDailyS1.sh >$LP_s/MirrorLogS1.txt

Where SP_s is the path to the script and LP_s

Answer 1

A bit tricky if you want stdout and stderr combined in one file, with stderr yet tee'd into its own stream.

This ought to do it (error-checking, clean-up and generalized robustness omitted):

#! /bin/sh

CMD=..../StartDailyS1.sh
LOGFILE=..../MirrorLogS1.txt
FIFO=/tmp/fifo

>$LOGFILE

mkfifo $FIFO 2>/dev/null || :

tee < $FIFO -a $LOGFILE >&2 &

$CMD 2>$FIFO >>$LOGFILE

stderr is sent to a named pipe, picked up by tee(1) where it is appended to the logfile (wherein is also appended your command's stdout) and tee'd back to regular stderr.