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Small correction..

awk '{$0=substr($0,1,7)""substr($0,9,1)}1' file

cut option..


cut -c 1-7,9- filename

try:
awk 'NR==FNR{a[$0]=$0;next}!a[$0]{print}' file2 file1

Just check, but ksh93 is installed in standard in all the Aix servers I've met these days.

Have a look in /usr/bin/ in order to check if you have ksh and ksh93 ( ls -l /usr/bin/ksh* )
If ksh93 is present you can check your commands like this :

#/usr/bin/ksh93
#typeset -F3 x=1.455...