Whilst searching for a proper solution to create font metrics for a bunch of TrueType fonts to be used with Apache FOP I came up with the following BASH Shell-Script snippet:
for ttf_file in *.ttf; do
fop-ttfreader "${ttf_file}" \
"${ttf_file%%.ttf}-metrics.xml";
done
It will create metric files for all TrueType fonts (*.ttf) located in the current directory.
Just make sure to install Apache FOP first. On my Ubuntu GNU/Linux box I had to install a package called "fop":
# sudo apt-get install fop
