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.
Titus
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<?=$a=$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.