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fx# cat > test.txt
I have a good idea!
And you?
fx# cat test.txt
I have a good idea!
And you?
fx#
---实现要求：在?后新开一行，按ctrl+D。必须是在行首的^D才有效。
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fx# cat > test.txt <? I have a Good Idea!
? And You?
? NO.
? GO!
fx# cat test.txt
I have a Good Idea!
And You?
NO.
fx#
---实现要求：必须在行首的，符合<<后面的字符，等于结束字符。
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3、
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