`Fold`

fold:

  • manual:

    Usage: fold [OPTION]… [FILE]… Wrap input lines in each FILE, writing to standard output.

  • example:

    1
    2
    3
    4
    5
    6
    7
    
    $ echo "Hello" > t1
    
    $ echo "World" > t2
    
    $ fold t1 t2
    Hello
    World