Print out a preview of all installed Figlet fonts.

figletpreview.sh

#!/bin/sh

if [ "$#" -ne 1 ]; then
    echo "I need some text to print."
    exit 1
fi

for i in `ls /usr/local/Cellar/figlet/2.2.5/share/figlet/fonts/*.flf`; do
    echo -e "==== $(basename $i) ====\n"
    figlet -f $i $1
    echo -e "\n\n\n"
done

Note for Debian users: The figlet package already provides the showfigfonts command which works the same.