How to Install srilm for Kaldi on RedHat / Ubuntu

Current versions of Kaldi do not install srilm as a default tool.

While trying to install srilm on RedHat / Ubuntu, I encountered some problems. Here are the tricks for these problems.

1. Simply running /tools/extras/install_srilm.sh cannot install srilm automatically.
2. The right procedure is as follows.
   1. Download srilm package from http://www.speech.sri.com/projects/srilm/download.html.
   2. Rename the package as “srilm.tgz”.
   3. Copy the package to /tools.
   4. Run /tools/extras/install_srilm.sh.
   5. Source /tools/env.sh.
3. For a safer option, you may add the content in /tools/env.sh into ~/.bash_profile.