#!/bin/bash
# http://redsymbol.net/articles/unofficial-bash-strict-mode/

set -eu
set -o pipefail

if [ $# -gt 0 ]
then
	FILENAME=$1
else	
	FILENAME=foo
fi

echo "foo is $FILENAME"

#set -x

NUMLINES=0

# cat $FILENAME |
while read x
do
    NUMLINES=$(($NUMLINES + 1))
    #echo "$NUMLINES: $x"
done    < $FILENAME
set -x
echo $NUMLINES