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is it possible to use this output to replace text from another file in one command?

ie: replace the "720" in line 1 of a different file with text comtaining "Sieved to 720" with the 2641569270623...

both arguments work PERFECTLY. thanks alot guys!

how can i output the number 2641569270623 from a text file called checkpoint.txt that is a one line file (generated by a maths sieving program) that looks like: ...