Unpack zip files from usenet.

unpack

#!/usr/local/bin/bash

zipOutput=/tmp/$$.tmp

die()
{
    echo $* 1>&2
    exit 1
}

run_unpack()
{
    local file="$1" parFile= prefix=
    # unzip the zip file, saving the output of the unzip command.
    (unzip $file | tee "$zipOutput") || die "failed to unzip file $file"

    # using the output of the unzip command, find par2 file with the shortest file name.
    parFile=`cat "$zipOutput" | awk '/extracting/ && $2 ~ /par2$/ {print $0, length($NF)}' | sort -n -k 3 | head -1 | awk '{print $(NF-1)}'`

    # bail out if there isn't a par2 file.
    if [[ -z "$parFile" ]]
    then
        die "didn't find a par file"
    fi

    echo parFile $parFile

    # Run the par2 recovery.
    par2 r "$parFile" || die "failed to run par2"

    # Build the end file from the rar files.
    unrar e `awk '$2 ~ /rar$/ {print $2}' "$zipOutput"` || die "unrar failed"

    # Get the first piece of text from the par2 file.
    prefix=`echo "$parFile" | awk -F. '{print $1}'`

    # Use the prefix to remove files not needed any more.
    rm $file "$prefix".*.par2 "$prefix".*.sfv "$prefix".*.nfo "$prefix".*.r??
}

## MAIN

# if there are command line args, assume that the args are files to be unpacked.
if [[ ! -z "$1" ]]
then
    for f in "$@"
    do
        run_unpack "$f"
    done
else
# OR use select, ls and perl to offer a list of possible selections.
    PS3="Select zip file to unpack: "
    select file in `ls | perl -ne '/^(1\d|\d).*\.zip$/ && print'`
    do
        run_unpack "$file"
        break
    done
fi

rm -f "$zipOutput"