$REPLY 在Shell中

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 1 #!/bin/bash

  2 # reply.sh
 3 
 4 # REPLY是'read'命令结果保存的默认变量.
 5 
 6 echo
  7 echo -n "What is your favorite vegetable? "
 8 read
 9 
10 echo "Your favorite vegetable is $REPLY."
11 #   当且仅当在没有变量提供给"read"命令时,
12 #+ REPLY才保存最后一个"read"命令读入的值.
13 
14 echo
15 echo -n "What is your favorite fruit? "
16 read fruit
17 echo "Your favorite fruit is $fruit."
18 echo "but..."
19 echo "Value of \$REPLY is still $REPLY."
20 #    $REPLY还是保存着上一个 read命令的值, 
21 #+ 因为变量$fruit 被传入到了这个新的"read"命令中.
22 
23 echo
24 
25 exit 0
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