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Linux Disable Wireless Networking ( Wi-Fi )

We have over 20+ Dell Precision M6400 laptops pre installed with Red Hat Enterprise Linux version 5.x. I was asked to disable Wi-Fi on all laptops as it poses a serious security risk to our sensitive (classified) systems and networks. How do I disable wireless networking (802.11) under Linux?
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xargs: How To Control and Use Command Line Arguments

I am trying to use xargs command using shell pipes and not able to understand how to control and use command line arguments. For example I'd like to find out all *.c file located in 100s of sub-directories and move them to another directory called ~/old.src. How do I use command line args with xargs to achieve the same?
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How To: Rename A File In Bash

How do I rename a file in bash under UNIX / OS X / Linux / BSD operating systems?
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Unix Command To Rename A Folder

How do I rename a folder under UNIX operating systems using a command line tools?
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UNIX Command To Rename A File

How do I rename a file in UNIX using command line options?
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UNIX mv Command Examples

How do I use mv command to rename or move file under UNIX operating systems?
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Bash Shell: Replace a String With Another String In All Files Using sed and Perl -pie Options

How do I replace a string with another string in all files? For example, ~/foo directory has 100s of text file and I'd like to find out xyz string and replace with abc. I'd like to use sed or any other tool to replace all occurrence of the word.
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