题目内容

He started to retrace his family rootsthreeyears ago

A. 对
B. 错

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He went to Belfast and found the house where his great-grandfather was born.

A. 对
B. 错

She would like to look into her family history in the future.

A. 对
B. 错

( )命令能用来查找在文件TESTFILE中包含4个字符的行。

A. grep '???? ' TESTFILE
B. grep '…. ' TESTFILE
C. grep '^????$' TESTFILE
D. grep '^….$ ' TESTFILE

( )命令可以把f1.txt复制为f2.txt。

A. cp f1.txt | f2.txt
B. cat f1.txt | f2.txt
C. cat f1.txt > f2.txt
D. copy f1.txt | f2.txt