paste

Merge lines of files. More information: https://www.gnu.org/software/coreutils/paste.

• Join all the lines into a single line, using TAB as delimiter:
  paste -s {{path/to/file}}
• Join all the lines into a single line, using the specified delimiter:
  paste -s -d {{delimiter}} {{path/to/file}}
• Merge two files side by side, each in its column, using TAB as delimiter:
  paste {{file1}} {{file2}}
• Merge two files side by side, each in its column, using the specified delimiter:
  paste -d {{delimiter}} {{file1}} {{file2}}
• Merge two files, with lines added alternatively:
  paste -d '\n' {{file1}} {{file2}}