whatisthere.sh

#!/bin/sh

whatisthere () {
  for dir in `echo $PATH | sed 's/:/ /g'`; do
    for file in $dir/*; do
      base=`basename $file`
      desc=`whatis $base 2>&1`
      [ $? -eq 0 ] && echo $desc
    done
  done
}

whatisthere | sort | less -SR