Generate PDF file of source code using enscript and ps2pdf

enscript -r \
    --columns=2 \
    --file-align=1 \
    --highlight \
    --color=1 \
    --line-numbers \
    --header='$N|Page $% of $=' \
    -o - \
    `find . -name '*.java'` \
    | ps2pdf - files.pdf