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This is my the content of my rootfs.cpio file:

[root@xilinx output]#  cpio -idv  < rootfs.cpio
1149 blocks 

What is . here ?

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. is the current directory. All directories on Linux file systems contain the hardlinks . and .. (the parent directory). For example:

 $ ls -a / | head -4

This is what enables you to do cd ../ to move to the parent directory or use constructs like find . to search the current directory (though the . is actually implied in find).

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