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I installed the Ubuntu 12.04 then I reinstalled Ubuntu 12.10 (the version along with Window 7) When I was using Ubuntu 12.04, I typed ls to show what file are listed in directory(included arm-linux-gcc-4.5.1-v6-vfp-20120301.tgz) And the list show out the file that are needed to be extracted. And that i type sudo tar -zxvf arm-linux-gcc-4.5.1-v6-vfp-20120301.tgz -C / and file was extracted in the same directory with zip file and own by user. After i install Ubuntu 12.10 redo the processes

  1. ls (check file again)
  2. sudo tar -zxvf arm-linux-gcc-4.5.1-v6-vfp-20120301.tgz -C / and the extracted file was in the File System and owned by root and adminstrator can't use it.

What's wrong??

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I am not sure what you wanted to accomplish here, but you told your computer to do exactly that.

running a program via sudo executes it in the context of the root user, all files created in that process will normally belong to root. The -C / parameter of tar, tells tar to extract to the / Directory, you actually need root permissions to do that at all.

If you just want to unroll the file contents into your home directory, simply run tar -zxvf arm-linux-gcc-4.5.1-v6-vfp-20120301.tgz, you may want to make sure, you are in your home directory first by enterin cd ~.

You might want to consider using a graphical program like xarchiver for unzipping, depending on what you demand of yourself (maybe ou want to become a command line crack, this would be a honourable goal ;-).

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Out of curiosity... why are you unpacking a C compiler runnable on arm architecture? – Paul Hänsch Oct 28 '12 at 8:47

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