OUTPUT:-
Z:>xargs -d \n p4 delete < deletefiles.txt
xargs: illegal option -- d
Usage: xargs [-0prtx] [-e[eof-str]] [-i[replace-str]] [-l[max-lines]]
       [-n max-args] [-s max-chars] [-P max-procs] [--null] [--eof[=eof-str]]
       [--replace[=replace-str]] [--max-lines[=max-lines]] [--interactive]
       [--max-chars=max-chars] [--verbose] [--exit] [--max-procs=max-procs]
       [--max-args=max-args] [--no-run-if-empty] [command [initial-arguments]]