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awk 'NR % 2 == 1 { o=$0 ; next } { print o "<sep>" $0 }'

Success #stdin #stdout 0.03s 5308KB

stdin

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line1
line2
line3
line4

stdout

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line1<sep>line2
line3<sep>line4

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language:

Bash (bash 5.0.3)

created:

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