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fn: change venerable play/shp behavior: affect last process rather than first

this ends up being the most frequent use in practice, whenever
there are multiple play(1)ers

--- a/fn

+++ b/fn

@@ -16,9 +16,9 @@

 # resume playback

 fn sta{ for(i in `{fpl}) echo 'echo start >/proc/'^$i^/ctl }

 # shortcuts for first play(1) process

-fn Fw{ fw | sed 1q | rc }

-fn Sta{ sta | sed 1q | rc }

-fn Sto{ sto | sed 1q | rc }

+fn Fw{ fw | tail -1 | rc }

+fn Sta{ sta | tail -1 | rc }

+fn Sto{ sto | tail -1 | rc }

 # recursively list all files in arguments and play shuffled list forever

 fn shp{ *=`"{walk -f $*}; while(! ~ $#* 0) play `'

 '{echo -n $* | shl} |[2] sed -u '/^COVERART/d'}