Renames the split (multi-volume) RAR files from the old naming scheme to one of the newer ones.

rename_split_RAR_files.sh

#!/bin/bash

# Oliver Blaser - gist.github.com/oblaser
# 02.12.2021

# Renames the split (multi-volume) RAR files from the old
# naming scheme to one of the newer ones.

# Useage: Edit the following parts of the script
# - Set the variables "orig" and "dest" to the filenames without
#   the extension (stem names)
# - Select the command (un-/comment)
# - Select the scheme
# - Set the number of the last *.rNN file (eg. it's *.r09 set last=9)

orig=the-original-rar-archives # the-original-rar-archives.rar the-original-rar-archives.r00 *.r01 ...
dest=archive

command="echo -e \"\033[91mselect the right command!\033[39m\" \"    \""
#command="mv"
#command="cp -i"

# 0: *.NNN.rar
# 1: *.partNN.rar
scheme=-1

last=-1




errCnt=0

function onError()
{
    ((++errCnt))

    if [ $1 == "rar" ]; then
        echo -e "\033[91merror:\033[39m *.rar"
    else
        echo -e "\033[91merror:\033[39m *.r$(printf "%02d" $1)"
    fi
}

if [ $scheme -eq 0 ]; then

    echo "$orig.rar  ->  $dest.000.rar"
    eval $command $orig.rar $dest.000.rar
    if [ $? -ne 0 ]; then onError "rar"; fi;

    for ((i=0; i<=$last; ++i))
    do
        tmpOrig=$orig.r$(printf "%02d" $i)
        tmpDest=$dest.$(printf "%03d" $((i+1))).rar

        echo "$tmpOrig  ->  $tmpDest"
        eval $command $tmpOrig $tmpDest

        if [ $? -ne 0 ]; then onError $i; fi;
    done

else # [ $scheme -eq 0 ]

    if [ $scheme -eq 1 ]; then

        echo "$orig.rar  ->  $dest.part01.rar"
        eval $command $orig.rar $dest.part01.rar
        if [ $? -ne 0 ]; then onError "rar"; fi;

        for ((i=0; i<=$last; ++i))
        do
            tmpOrig=$orig.r$(printf "%02d" $i)
            tmpDest=$dest.part$(printf "%02d" $((i+2))).rar

            echo "$tmpOrig  ->  $tmpDest"
            eval $command $tmpOrig $tmpDest

            if [ $? -ne 0 ]; then onError $i; fi;
        done

    else # [ $scheme -eq 1 ]
        echo -e "\033[91munknown scheme: $scheme\033[39m"
    fi # [ $scheme -eq 1 ]

fi # [ $scheme -eq 0 ]

if [ $last -lt 0 ]; then echo -e "\033[91minvalid last *.rNN: $last\033[39m"; fi;

if [ $errCnt -ne 0 ]; then
    if [ $errCnt -eq 1 ]; then
        echo -e "\n  \033[91m$errCnt error\033[39m\n"
    else
        echo -e "\n  \033[91m$errCnt errors\033[39m\n"
    fi
fi