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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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Shell Script To Number Lines Of Files

Q. How do I number each line of a text file? How do I write a shell script to display text file with line numbers added?
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Howto: Linux command line utilities for removing blank lines from text files

Q. I want to change the formatting of a file. I just wanted to remove all blank lines from text file. How do I achieve this task w/o spending much time?
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