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lang-c
fmt -w29do?fmt-- OP did not specify an execution platform. I refer you to the fmt man page: "Lines are joined or split only at white space". When porting this solution to fmt (GNU coreutils) 8.32, I see they apparently introduced an OBOB or made an undocumented change in the meaning of "maximum line width", as we find that at leastfmt -w30is needed. (I will update my Answer to use30.)A1,A2, etc. are primer-set names, andR1/R2are the paired reads. The sequencing software outputs files with these two strings joined via_underscore. But what happens if some primer-set names areA1,A2, etc., while others areGTAAAACGACGGCCAG(i.e. the string length varies from primer-set to primer-set)?fmtapproach, because it seems powerful. However AIUI to usefmtan end-user has to make the assumption that input linewise character lengths ('filenames', in this example), are non-varying. Thefmtapproach could work just fine for some identifiers (e.g. Ensembl_IDs (such asENSRNOG00000000007,ENSRNOG00000071217, etc.), which seemingly maintain consistent length. Thank you.fmt) as a generic solution.