No variable $lettert

I would like to suggest the following snip:

Code:

while IFS= read line; do
  for word in $line; do
      if [ -n $word ]; then
          echo "${word}: ${#word}"
      fi
  done
done < "$@"

After making the script executable it can be invoked as:

Code:

/path/to/mapper.sh /path/to/text.txt

This other one could be an evolution of it:

Code:

while IFS=  read line; do
    for word in $line; do
        [ -n $word ] && echo "${word}: ${#word}"
    done
done < "$@"

It doesn't hurt but it doesn't matter to double quote the variable word (in this case). There is no need to protect against variable word splitting because of the for loop

In fact, this could be one of those occasions where the following design might be acceptable.

Code:

for word in $(cat text.txt); do
   [ -n $word ] && echo "$word ${#word}"
done

Please, do not use a for loop to read from a $(cat file) to just read from a file. Normally, you want to prevent exactly what you want this time.