DEPRECATED: There is show_lattice.sh based on this script http://sourceforge.net/p/kaldi/code/HEAD/tree/trunk/egs/wsj/s5/utils/show_lattice.sh

draw_lattices.sh

#!/bin/bash
# source: https://gist.github.com/oplatek/7180425

# DEPRECATED: There is show_lattice.sh based on this script
# http://sourceforge.net/p/kaldi/code/HEAD/tree/trunk/egs/wsj/s5/utils/show_lattice.sh

# Kaldi recipes creates and stores lattices for several utterances into lat.1.gz files typically in #`exp/acoustic_model_name/decode` directory e.g. 
#`exp/tri1/decode/lat1.gz`.
#This script takes two parameters: a) The gunzipped file b) the word symbol table (WST) typically stored in #`exp/acoustic_model_name/graph/words.txt` e.g. `exp/tri1/graph/words.txt`
# The script creates a pdf files displaying the words lattice for each of decoded utterance.

lat_gz=$1
wst=$1  # word symbol table e.g. exp_name/graph/words.txt
format=svg  # pdf ps

gunzip -c $lat_gz | lattice-copy ark:- ark,scp:foo.ark,foo.scp; cat foo.scp | \
cut -d' ' -f2 | \
while read ark ; do 
    echo dummy_id $ark | lattice-copy scp:- "scp:echo dummy_id $ark.lat|" 

    sed -i '1s/^/dummy_id /' $ark.lat
    lattice-to-fst ark:$ark.lat ark:$ark.fst

    sed -i '1s/^dummy_id //' $ark.fst
    fstdraw --portrait=true --osymbols=$wst $ark.fst | \
        dot -T${format} > $ark.${format} ; 
done

Thank you. Your script has been a great help to me.