A fun trick is using the `paste` command with process substitution to combine lines of output from different commands.

  ./cmd1

outputs:

  a
  b
  c

  ./cmd2

outputs:

  1
  2
  3

  paste <(./cmd1) <(./cmd2)

outputs:

  a 1
  b 2
  c 3

You can then use xargs to use each line as arguments for another command:

  paste <(./cmd1) <(./cmd2) | xargs -L1 ./cmd3

calls:

  ./cmd3 a 1
  ./cmd3 b 2
  ./cmd3 c 3