Print read progress of pids with open files

progress.sh

#!/bin/bash

find-open-files() {
	find /proc/$1/fd/ -maxdepth 1 -lname '/*' -not -lname '/dev/*' -printf "%f\n"
}

format-file() {
	readlink -f /proc/$1/fd/$2
}

progress-file() {
	pos=$(cat /proc/$1/fdinfo/$2 | awk '$1 == "pos:" {print $2}')
	size=$(stat -L --format '%s' /proc/$1/fd/$2)
	echo $((pos * 100 / size))'%'
}

progress() {
	local pid=$1
	for file in $(find-open-files $pid); do
		echo $(progress-file $pid $file) $(format-file $pid $file)
	done
}

for pid in $*; do
	progress $pid
done