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HowTo: Use cat Command In Linux / UNIX

How do I use cat command in Linux? How do I use cat command in UNIX? How can I use cat command in UNIX or Linux shell scripts?
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How do I open and edit multiple files on a VIM text editor running under Ubuntu Linux / UNIX-like operating systems to improve my productivity?
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KSH Send Email Attachments Using a Scripts

How do I send an email attachment via KSH shell script under UNIX operating systems?
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HowTo: Create a Hard Links in Linux / UNIX

Both Linux / UNIX allows the data of a file to have more than one name in separate places in the same file system. Such a file with more than one name for the same data is called a hard-linked file. How do I create a hard link under Linux / UNIX / Apple Mac OS X / BSD operating systems?
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How can I keep out certain files when creating a tarball? For example:

/home/me/file1
/home/me/dir1
/home/me/dir2
/home/me/abc
/home/me/xyz

How do I exclude zyz and abc file while using a tar command?
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