Shell Programming and Scripting

I'm using shell scripts to run some commands for the Configuration Management tool called Telelogic Synergy.

I need to get the script to compare version numbers of files. The version numbers of the files are part of the actual filename, such as the following example:

example_file-1
example_file-2

I retrieve the version number of the files by doing a "cut" on the file name.

This is an extract from my script (the "ccm ls" part is CM Synergy command) where I'm using the cut command to read the file version:

DEPLOYED_VERSION=`ccm ls ${TARGET_FILE} | cut -f2 -d"-"`

The next line compares versions of a file:

if [ $TARGET_FILE_VERSION -lt $DEPLOYED_VERSION ]

This works fine when file version numbers are whole numbers, but if I have a version of a file with decimal places such as "example_file-1.1.1", then the script thinks that the "1.1.1" is a text string rather than a number and then throws up the "Integer expression expected" error message against the line of the script where I'm using the "-lt" switch.

Does anybody know how I can get the script to recognise numbers with decimal places as a numerical value instead of a text string?

Hope this makes sense, thanks in advance.