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UNIX: Loop Through Files In A Directory

How do I loop through files in a directory under UNIX like operating systems?
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Truncate Large Text File in UNIX / Linux

How do I truncate or shrink large text file under UNIX / Linux operating systems?
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Removing a Directory In Linux

How do I remove a directory in Linux using the shell prompt?
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How To: Upgrade CentOS Linux 5.3 to v5.4

How do I upgrade CentOS Linux from version 5.3 to latest version 5.4 over the Internet?
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How do I set the prefixlen for an IPv6 address under FreeBSD operating systems?
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Mac OS X Start / Stop Apache Web Server

How do I start or stop Apache web server using shell prompt option under Apple OS X UNIX operating systems?
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Clear Shell History In Ubuntu Linux

How do I clear the shell history in Ubuntu Linux?

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