regex - Excuting text via linux shell -

is there way in linux command ,when give list text aaaaaaaaaa.htm 4 bbbbbbbbbb.htm 5 .... give me result aaaaaaaaaa_2.htm aaaaaaaaaa_3.htm aaaaaaaaaa_4.htm bbbbbbbbbb_2.htm bbbbbbbbbb_3.htm bbbbbbbbbb_4.htm bbbbbbbbbb_5.htm ... helps !

like this?

cat list.txt  aaaaaaaaaa.htm 4 bbbbbbbbbb.htm 5 awk '{gsub(/.htm/,"",$1);for (i = 2; i<=$2;i++){printf "%s_%s.htm\n",$1,i}}' list.txt  aaaaaaaaaa_2.htm aaaaaaaaaa_3.htm aaaaaaaaaa_4.htm bbbbbbbbbb_2.htm bbbbbbbbbb_3.htm bbbbbbbbbb_4.htm bbbbbbbbbb_5.htm