ddrescue-progress.sh

#!/bin/sh
md5=
file="${1:-Recovery.log}"
while :; do
    sleep 1
    _md5=$( md5 "$file" | awk '{print $NF}' )
    [ "$md5" != "$_md5" ] || continue
    pos=$( awk '/current/{getline;print $1}' "$file" )
    line=$( awk -v pos=$pos '$1==pos{line=NR}END{print line}' "$file" )
    lc=$( wc -l "$file" | awk '{print $1}' )
    pct="?"
    [ $line -le 4 ] || pct=$( echo "scale=2;$line*100/$lc" | bc )
    printf "%s @%d/%d %s (%.2f%%) %s\n" \
        "$( date )" "$line" "$lc" "$pos" "$pct" "$file"
    md5="$_md5"
done