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perl -i -pe 'BEGIN{open H,shift or die $!;$h=join&quot;&quot;,&lt;H&gt;} print $h if $.==1; close ARGV if eof;' TEXT big/*.c
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perl -i -pe 'BEGIN{open H,shift or die $!;$h=join"",<H>} print $h if $.==1; close ARGV if eof;' TEXT big/*.c

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I have a directory of C files(BIG Directory) I want to append (or add) a header (my name...etc) &nbsp;at the beginning of each file in the directory. The header is big so I put it in a file TEXT. I don't want to go through each file and copy/paste the header. So what script can I use? 
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I have a directory of C files(BIG Directory) I want to append (or add) a header (my name...etc)  at the beginning of each file in the directory. The header is big so I put it in a file TEXT. I don't want to go through each file and copy/paste the header. So what script can I use? 

Appending text to multiple files?

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.