For my Ubuntu system I did as Lian Tze Lim suggested. Use the package manager to install the itrans and itrans-fonts packages. No muss No fuss.
For Windows and MiKTex 2.9 the set up process was more involved. Below is the batch file I created to facilitate the copying.
1) Install MiKTeX
2) Use the MiKTeX package manager to install the indic-type1 package and the devanagari packages.
3) download itrans53-win32.zip from http://www.aczoom.com/files/itrans/53/itrans53-win32.zip
4) extract itrans53-win32.zip to some temporary location. I used C:\temp\Tamil\ITRANS53.
5) Open a command window which is running as administrator. (many of the copies are into c:\program files\ and that requires the process be run with elevated privilege)
6) CD to the temporary location of ITrans (e.g. C:\temp\Tamil\ITRANS53)
7) execute the batchfile commands below.
8) close the command window
9) Right click on start->computer and select Properties.
10) Select Advanced System Settings->Environment Variables
11) add new system environment variable named: ITRANSPATH. See the batch file commands below for the exact value for this variable.
12) open a command window
13) The command:
itrans -I <filename>.itx -o <filename>.tex
will now work and (pdf)latex can resolve the packages, fonts, and commands referenced in the output from itrans.exe.
I can now process LaTeX files in both Ubuntu and Windows 7 and have the source files (.Tex, .ITX, etc.) under revision control
The batch file is:
echo off
rem Record where is MikTeX is installed
set MiktexRoot=C:\Program Files\MiKTeX 2.9
rem copy itrans.exe to a directory already within the path environment variable
rem namely the path adjustment made by the installer for MiKTeX which puts
rem all of the MiKTeX installed tools on the PATH variable
rem
rem for 32-bit windows systems remove the x64 suffix
copy ".\bin\*.exe" "%MiktexRoot%\miktex\bin\x64\*.*" /Y /V
rem Create the directories within the MikTeX structure used or referenced by the itrans package
mkdir "%MiktexRoot%\doc\itrans"
mkdir "%MiktexRoot%\doc\itrans\contrib"
mkdir "%MiktexRoot%\fonts\source\public\itrans"
mkdir "%MiktexRoot%\fonts\type1\public\itrans"
mkdir "%MiktexRoot%\fonts\tfm\public\itrans"
mkdir "%MiktexRoot%\fonts\afm\public\itrans"
mkdir "%MiktexRoot%\fonts\truetype\public\itrans"
mkdir "%MiktexRoot%\tex\latex\itrans"
mkdir "%MiktexRoot%\tex\latex\itrans\fonts"
rem Copy itrans package files into the MiKTeX structure
rem used http:\\tex.stackexchange.com\questions\1754\tamil-tex-in-windows
rem and the installation script for Tamil-Omega as guides for the copy commands
rem Listed below
rem
rem Copy Documentation files
copy ".\doc\*.*" "%MiktexRoot%\doc\itrans\*.*" /Y /V
copy ".\contrib\*.*" "%MiktexRoot%\doc\itrans\contrib\*.*" /Y /V
rem copy Font Files
copy ".\lib\fonts\*.mf" "%MiktexRoot%\fonts\source\public\itrans\*.*" /Y /V
copy ".\lib\fonts\*.pfa" "%MiktexRoot%\fonts\type1\public\itrans\*.*" /Y /V
copy ".\lib\fonts\*.pfb" "%MiktexRoot%\fonts\type1\public\itrans\*.*" /Y /V
copy ".\lib\fonts\*.pfm" "%MiktexRoot%\fonts\type1\public\itrans\*.*" /Y /V
copy ".\lib\fonts\*.tfm" "%MiktexRoot%\fonts\tfm\public\itrans\*.*" /Y /V
copy ".\lib\fonts\*.afm" "%MiktexRoot%\fonts\afm\public\itrans\*.*" /Y /V
copy ".\lib\fonts\*.ttf" "%MiktexRoot%\fonts\truetype\public\itrans\*.*" /Y /V
rem copy all of the ITRANS Lib structure into MiKTeX structure.
copy ".\lib\*.*" "%MiktexRoot%\tex\latex\itrans\*.*" /Y /V
copy ".\lib\fonts\*.*" "%MiktexRoot%\tex\latex\itrans\fonts\*.*" /Y /V
rem post installation commands to rebuilt the font name database ans to process all of the font MAPping files.
texhash
updmap
rem
rem With the above copies MikTeX can now find the ITRANS fonts and resolve references created by the itrans.exe preprocessor
rem
rem But the preprocessor cannot be run from the command line because itrans.exe is expecting to find a
rem specific ITRANS structure somewhere on the disk via the environment variable: ITRANSPATH
rem instruct the user about this environment variable requirement
rem
echo "Set the environment variable: ITRANSPATH"
echo "ITRANSPATH=%MiktexRoot%\tex\latex\itrans;%MiktexRoot%\tex\latex\itrans\fonts"