`paste` - merge lines of files side by side (GNU coreutils)

paste [-s] [-d LIST] [FILE]...

Options you will use

-d, --delimiters=LIST: use the characters of LIST in turn instead of TAB
-s, --serial: one file at a time: all its lines on one line
-: standard input; each - takes the next line, so paste - - joins lines in pairs

$ ... | paste - -

two lines become one: name and value side by side

$ paste -d, a.txt b.txt

two files as CSV columns

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