linux - Joining a pair of lines with specific starting points -

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i know sed can print

cat current.txt | sed 'n;s/\n/,/'  > new.txt b c d e f

to

a,b c,d e,f

what following:

a b c d e f

to

a,d b,e c,f

i'd join 1 4, 2 5, 3 6 , on. possible sed? idea how achieved?

thank you.

try printing in columns:

pr -s, -t -2 current.txt

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