UNIX for Advanced & Expert Users

while read line; do
first=$(echo $line |cut -c1-3)
second=$(echo $line |cut -c4-5)
third=$(echo $line |cut -c6-9)
fourth=$(echo $line |cut -c10-)
echo $first,$second,$third,$fourth
done < inputfile

$ cat inputfile
11234asdewdlt

[/tmp]$ cat try.ksh
#! /bin/ksh

typeset -L3 first
typeset -L2 second
typeset -L4 third

while read line
do

        first=$line
        line=${line#$first}
        second=$line
        line=${line#$second}
        third=$line
        last=${line#$third}

        echo "$first,$second,$third,$last"
done < t
[/tmp]$ cat t
11234asdewdlt
[/tmp]$ ./try.ksh 
112,34,asde,wdlt
[/tmp]$