tar command

How can I extract or uncompress a file from tar ball downloaded from the Internet under Linux using bash command prompt?

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How do I remove a directory from a tar ball under Unix / Linux operating systems?

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I‘d like to make / file system backup but the problem is there are other file systems mounted under / such as:

/mnt/cdrom
/mnt/nfs
/iscsi
/boot
/var

I’d like to skip all other file systems mounted at / and only make backup of local / and not /boot, /var, /iscsi, and /mnt/cdrom etc. How do I force tar to use a single file system under Linux / UNIX / BSD operating systems?

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How do I compress and backup files using tar command to another directory on same computer or another Linux computer under Ubuntu Linux?

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Q. I’ve couple of large tarballs such as www.tar and images.tar. Is it possible to extract a single file or a list of files from a large tarball such as images.tar instead of extracting the entire tarball? How do I extract specific files under Linux / UNIX operating systems?

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Q. When I run tar command it fails with an error that read as follows: tar: /dev/st0: Cannot write: Invalid argument How do I fix this error under CentOS / Debian / Fedora / RHEL Linux HP server systems?

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I have installed OpenBSD operating system but ports collection is missing at /usr/ports directory. How do I install ports from ftp / http site under OpenBSD?

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