Version Comparison using KSH - unix

Question

I'm trying to write a function to compare the versions of the products.
my versions can be XX.XX.XX or xx-xx-xx either it's separated with "." or "-"
and number of fields can be different either xx.xx or xx.xx.xx or xx.xx.xx.xx
the versions which im gonna compare will identical in delimiters and with the fields
#!/bin/ksh
set -x
compareVersions ()
{
typeset IFS='.'
typeset -a v1=( $1 )
typeset -a v2=( $2 )
typeset n diff
for (( n=0; n<4; n+=1 )); do
diff=$((v1[n]-v2[n]))
if [ $diff -ne 0 ] ; then
[ $diff -le 0 ] && echo '-1' || echo '1'
return
fi
done
echo '0'
} # ---------- end of function compareVersions ----------
#compareVersions "6100-09-03" "6100-09-02"
compareVersions "6100.09.03" "6100.09.02"
Please check and give me suggestions
I have tried with the below thing which i have got a other post.. but there is no luck.. hope there should some modification should be done. I have to use across platforms ( linux, solaris, AIX ) so i have preferred KSH, i have idea only in shell scripting though.

Answer 1

Create arrays from version strings, then loop through them comparing elements one by one and return values accordingly. The following example will compare two version strings and returns either 0 (versions are equal), 1 (the first version string is greater) or 2 (the second version string is greater).
#!/bin/ksh
function vertest {
set -A av1 `echo $1 | sed -e 's/\'$3'/ /g'`
set -A av2 `echo $2 | sed -e 's/\'$3'/ /g'`
for (( i=0; i < ${#av1[#]}; i++ )) ; do
[[ ${av1[$i]} -eq ${av2[$i]} ]] && continue
[[ ${av1[$i]} -gt ${av2[$i]} ]] && return 1
[[ ${av1[$i]} -lt ${av2[$i]} ]] && return 2
done
return 0
}
v1="2-7-2-1"
v2="1-8-0-1"
vertest $v1 $v2 '-'
exit $?
# end of file.
This example will exit to shell with exit code 1. Should you change $v1 to 1-7-2-1, it will exit to shell with exit code 2. And so on, and so forth.
The separator escaping is not complete, but this works with most reasonable separators like a period (.) and a dash (-). This, as well as parameter checking for the vertest() is left as an exercise for the reader.

Answer 2

When the format of both numbers is equal (leading zero as your example), you can use
compareVersions ()
{
val1=$(echo $1| tr -d ".-")
echo ${val1}
val2=$(echo $2| tr -d ".-")
echo ${val2}
if [ ${val1} -gt ${val2} ] ; then
echo 1
return
fi
if [ ${val1} -eq ${val2} ] ; then
echo 0
return
fi
echo '-1'
} # ---------- end of function compareVersions ----------