sheet/say: Escaping/quoting special shell character for help

sheets/say

@@ -11,10 +11,10 @@ say -f filename.txt
 say -v voice -r words_per_minute "I'm sorry Dave, I can't let you do that."
 
 # List the available voices.
-say -v ?
+say -v '?'
 
 # Hear the available voices.
-say -v ? | awk '{ print $1 }' | while read v; do echo "$v is speaking..."; say -v $v "Hi, my name is $v"; done
+say -v \? | awk '{ print $1 }' | while read v; do echo "$v is speaking..."; say -v $v "Hi, my name is $v"; done
 
 # Create an audio file of the spoken text.
 say -o filename.aiff "Here's to the Crazy Ones."