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#PHP, 44 bytes
<?=$a=$argn;while($a--)echo _,$a=rand(0,$a);
or
<?for(;$a=&$argn;$a=rand(0,$a))echo$a--,_?>0
print integers delimited by underscore. Save to file, run as pipe with -nF.
-nF
<?=$a=$argn;while($a--)echo _,$a=rand(0,--$a);
<?for(;$a=&$argn;$a=rand(0,$a))echoecho$a--$a,_?>0
<?=$a=$argn;while($a)echo _,$a=rand(0,--$a);
<?for(;$a=&$argn;$a=rand(0,$a))echo--$a,_?>0
