Changing Log Output

#!/bin/sh

PROGNAME=$(basename $(readlink -f $0))
LOG="output-$PROGNAME.log"

_output_echo () {
  while read data; do
    echo -e "$PROGNAME: $data"
    echo -e $data | _output_file
  done
}

_output_file () {
  while read data; do
    echo -e "$PROGNAME: $data" >> $LOG
  done
}

# program output to log file and optionally echo to screen (if $1 is "-e")
log () {
  if [ "$1" = '-e' ]; then
    shift
    $@ | _output_echo
  else
    $@ | _output_file
  fi
}

log echo "Log File Only"
log -e echo "Echo & Log File"