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  1. awk 'NR % 2 == 1 { o=$0 ; next } { print o "<sep>" $0 }'
Success #stdin #stdout 0.03s 5308KB
comments (?)
stdin 
line1
line2
line3
line4
stdout 
line1<sep>line2
line3<sep>line4
https://ideone.com/CvFNU
language:
Bash (bash 5.0.3)
created:
12 years ago
visibility:
secret

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