lab2 OS

if [[ $# < 2 ]]; then
  me=`basename "$0"`
  echo "Usage: ./$me <output file> <arg1> <arg2> ... <argN>"
  exit 1
fi

# count even numbers in c
# sum all numbers in s
# compute digit count for s in variable d
filename=$1
shift

c=0
s=0

for number in "$@" ; do
  (( s += number ))
  if [[ $((number%2)) -eq 0 ]]; then
    (( c += 1 ))
  fi
done

d=${#s}


if [ -f $filename ] && [ ! -L $filename ]; then
  # write c, s and d to file
  echo "count of even numbers is $c" >> $filename
  echo "sum of digits is $s" >> $filename
  echo "digit count for s is $d" >> $filename
else
  # error
  echo "File does not exist or is not a regular file!"
  exit 1
fi