are there are good,quick,small scripts to create summary statistics and histograms for numbers? numutils is mentioned in the description of moreutils, but it doesnt appear to provide those.

atchange is a handy script to trigger a command whenever a file gets updated. I use it to automate the edit-save-run loop when writing code. It’s not technically in my /bin directory, it’s in .bash_aliases as a shell script, which I wrote after reading about the original perl script described here

# atchange $1 $2
# runs command $2 whenever file $1 is modified
function atchange(){
  if [ "$#" -lt 2 ]
  then
    echo "Insufficient arguments. Requires at least 2"
    echo "Usage: atchange [filename] [command(s)]"
  else
    FILE="$1"
    shift
    COMMAND="$@"
    oldmodtime=""
    while [ -f "$FILE" ] || ! echo "File $FILE not found" 
    do 
      #inotifywait -qq -e modify "$FILE"; # disabled to remove dependency. use polling instead
      newmodtime=`stat -c %y "$FILE"`
      if [ -z "$oldmodtime" ]; then
        oldmodtime="$newmodtime"
      fi
      if [ "$newmodtime" != "$oldmodtime" ]; then
        echo "*** atchange: $FILE change detected ($newmodtime) ***"
        sleep 1 # may not be necessary
        $COMMAND
        oldmodtime="$newmodtime"
      fi
      sleep 2 # polling interval
    done
  fi
}