filegrowth

#!/bin/bash

# Watch files in the current working directory (or given argument)
# display how much a file has grown in the last second (or so)
# B9 2018

if [ -d "$1" ]; then
    cd "$1"
    shift
fi

orig=$(stat --format=$'%n\t%s' *)
old="$orig"
while sleep 1; do
    new=$(stat --format=$'%n\t%s' *)
    join <(echo "$old") <(echo "$new") |
	awk -v tick="'" \
	    '$2 != $3 { printf ("%" tick "*d %s\n", 20, $3-$2, $1) }'
    old="$new"
    echo
done