#!/bin/sh
LOGFILE="/var/log/logfile.log"
LOGERR="/var/log/error.log"

{
# IO redirection for logging.
touch ${LOGFILE}
exec 6>&1           # Link file descriptor #6 with stdout.
                    # Saves stdout.
exec > ${LOGFILE}   # stdout replaced with file ${LOGFILE}.

touch ${LOGERR}
exec 7>&2           # Link file descriptor #7 with stderr.
                    # Saves stderr.
exec 2> ${LOGERR}   # stderr replaced with file ${LOGERR}.
}