命令如下：
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[root@aws ~]# mkdir jiaguwen
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[root@aws ~]# touch jiaguwen.txt jiaguwen2.txt jiaguwen3.txt
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[root@aws ~]# cd jiaguwen
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[root@aws jiaguwen]# ls
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jiaguwen2.txt jiaguwen3.txt jiaguwen.txt
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[root@aws jiaguwen]# ls *.txt | xargs -n1 -i{} mv {} {}_bak
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[root@aws jiaguwen]# ls
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jiaguwen2.txt_bak jiaguwen3.txt_bak jiaguwen.txt_bak
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