paste(1) on Linux
The text 10a80184084c, as Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex) shipped it.
merge lines of files
Flags it lists
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--delimiters -
--help -
--serial -
--version -
-d -
-s