illdefined/spawn — comment on commit 461c64c9487de096887ad99249713f083f0f278b
File:  line 0
By illdefined:

`xargs` reads the command’s arguments from standard input and creates as many processes as needed up to the number specified by the `-P` option. After all arguments have been processed, it terminates, whereas `spawn` creates exactly the number of processes requested and respawns them indefintely.
I created `spawn` because I felt the need for something more sophisticated than `while true; do something; sleep 1; done` and did not see how any other command line utility could provide this functionality.