Recover from an Audacity crash by reassembling the saved data files

audacity_rescue.sh

#!/bin/bash
#Recover from an Audacity crash by reassembling the saved data files


if [ $# != 2 ]; then
    echo "ERROR: Not enough arguments"
    echo "$0 [SOURCE PATH] [DESTINATION]"
    exit 1
fi

DATA="$1/"
OUT=$2

if [ -e $OUT ]; then
    # Hope the path exists
    echo "ERROR: Output file exists ($OUT)"
    exit 1
fi

COUNT=1
FORMAT="%sb%.5d.au\n" # I don't know if audacity sometimes uses different name formats

while [ 1 ]; do
    FILE=$(printf $FORMAT $DATA $COUNT)

    if [ -e $FILE ]; then
        #The offsets are probably all going to be the same, but best check it
        OFFSET=$(echo $(od -i -j4 -N4 -An < $FILE) ) # Use echo for easy trim
        if [ $COUNT -eq 1 ]; then
            # Write the header
            dd ibs=$OFFSET count=1 if=$FILE of=$OUT
        fi
         echo "Adding $FILE (offset=$OFFSET)"
         dd ibs=$OFFSET skip=1 conv=notrunc oflag=append if=$FILE of=$OUT
    else
        break
    fi
    let COUNT+=1
    done

echo "Done"

I had problem with this script as the version of Audacity I use do not follow the same name format as the one used. Fixed in forked script (accepts any .au file).