Compression Comparison

bz2bz

#!/bin/sh
dir=${2##/usr/share/}
dir=${dir%/*}
file=${2##*/}
file=${file%.*}
ext=${2##*.}

mkdir -p $1/$dir
cp $2 $1/$dir/$file.$ext

bz2xz

#!/bin/sh
dir=${2##/usr/share/}
dir=${dir%/*}
file=${2##*/}
file=${file%.*}
ext=${2##*.}

mkdir -p $1/$dir
echo bzip2 -dkc $2 | xz -cz6e > $1/$dir/$file.xz

test

#!/bin/sh

compare() {
        local xzlarger=0
        local bz2larger=0

        for x in $(find xz -name "*.xz"); do
                xzsize=$(du -b $x | cut -f1)

                dir=${x##xz/}
                dir=${dir%/*}
                file=${x##*/}
                file=${file%.*}
                ext=${x##*.}

                bz2size=$(du -b bz2/$dir/$file.bz2 | cut -f1)

                if [[ $[xzsize] > $[bz2size] ]]; then
                        xzlarger=$[++xzlarger]
                else
                        bz2larger=$[++bz2larger]
                fi
        done

        echo "Larger xz count: $xzlarger"
        echo "Larger bz2 count: $bz2larger"
}

find /usr/share -type f -a -\( -wholename "/usr/share/doc/*.bz2" -o -wholename "/usr/share/man/*.bz2" -\) | xargs -n1 -P8 ./bz2bz bz2
find /usr/share -type f -a -\( -wholename "/usr/share/doc/*.bz2" -o -wholename "/usr/share/man/*.bz2" -\) | xargs -n1 -P8 ./bz2xz xz

du -sh bz2 xz
compare