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A.ls*.c
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D.finD.“*.c”
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A.catmail_A.txt>mail_B.txt
B.catmail_A.txt
D.catmail_A.txt|mail_B.txt
单项选择题
A.userdelete benet
B.userdel benet
C.userdel–x benet
D.userdel–r benet
单项选择题
A.ls–al|more
B.ls–l|more
C.ls–a|more
D.ls–type|more