regex - get all lines NOT end with 'rpms' in sed -

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i want append following line lines. if have tips, please let me know. lot.

i have tried 

sed -e '/?!(rpms$)/{n;s/\n//}' filename

but failed.

i think looking put lines don't end rpms on single line:

sed -e ':a;/rpms$/!{n;s/\n//;ba}'

instead of trying negate pattern, can negate test putting negation operator ! after pattern.

to handle case there more 2 lines without rpms @ end, added label :a , unconditional jump ba label.


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