A wrapper around RAR(1) for making archives on the form .rar .r00 etc.

r00.bash

#!/bin/bash

# Make rar multiparts with the extensions .rar .r00 etc.
# Many programs prefer / look for this, not the .partX.rar
# Usage: r00 [archive name OR file1] [file(s)]

# Enable evil expansion mode: +([0-9])
shopt -s extglob

for arg in "$@" ; do
	if test "$arg" == "--help" -o "$arg" == "-h" ; then
		echo "Usage:
	`basename $0` [archive name OR file1] [file(s)]

Note: If only one argument is given, and this does not exist, adds current working directory to archive of that name" >&2
		exit 0
	fi
done

if ! test -e "$1" ; then
	export RAR="${1%.rar}"
	shift
else
	export RAR="temp"
fi

rar a -m0 -v102400 "$RAR" "$@"
exitcode=$?

if test $exitcode -ne 0 ; then
	echo >&2
	echo "rar exited with code $exitcode. Not renaming." >&2
	exit $exitcode
fi

echo >&2
echo "Renaming archives. If the rar process didn't result in any multiparts, you will see some error messages here. They can safely be ignored." >&2
echo >&2

# This is the evil expansion mode =)
mv "$RAR".part*(0)1.rar "$RAR".rar

for file in "$RAR".part* ; do
	file2="${file%.rar}"
	# Haha, This is ugly syntax. Coerce to decimal base 10.
	mv "$file" "$RAR".r$((10#${file2#$RAR.part}-2))
done

# Fix the files called .r[0-9]
# TODO: We just make assumptions on file size here. If we add a really huge
#       file, it will make files .rar, .r00, .r01, ..., .r100, .r101 etc.
for file in "$RAR".r[0-9] ; do
	mv "$file" "$RAR.r0${file#$RAR.r}"
done

echo "Files renamed to $RAR.r*" >&2
echo >&2