paste — Merge lines of files. More information: <https://www.gnu.org/software/coreutils/manual/html_node/pas

Join all the lines into a single line, using `TAB` as delimiter

paste {{[-s|--serial]}} {{path/to/file}}

Join all the lines into a single line, using the specified delimiter

paste {{[-s|--serial]}} {{[-d|--delimiters]}} {{delimiter}} {{path/to/file}}

Merge two files side by side, each in its column, using `TAB` as delimiter

paste {{path/to/file1}} {{path/to/file2}}

Merge two files side by side, each in its column, using the specified delimiter

paste {{[-d|--delimiters]}} {{delimiter}} {{path/to/file1}} {{path/to/file2}}

Merge two files, with lines added alternatively

paste {{[-d|--delimiters]}} '\n' {{path/to/file1}} {{path/to/file2}}