Note that in the original sample input in this thread, the comma delimited field 7 and 8 for the 1st line is

Code:

4021375283,4021375682 HPAALI41215

not just 4021375283,4021375682. But, tweaking your suggestion a tiny bit more:

Code:

cut -d"," -f7,8 < file4 | tr ',' ' ' | while read A B junk; do `echo seq $A $B`; done

or getting rid of a process in the pipeline and the unneeded command substitution in the loop:

Code:

cut -d"," -f7,8 < file4 | while IFS=', ' read A B junk; do seq $A $B; done

might do what is wanted. I'm not sure that seq will print numbers in that range correctly. On some systems, the command:

Code:

seq 4021375283 4021375284

will print:

Code:

4.02138e+09
4.02138e+09

So, maybe you want something more like:

Code:

cut -d"," -f7,8 < file4 | while IFS=', ' read A B junk; do seq -f '%.0f' $A $B; done