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Top Forums UNIX for Dummies Questions & Answers Help with changing header of tsv with 30 million lines Post 302747593 by binlib on Friday 21st of December 2012 05:21:07 PM
Old 12-21-2012
I will assume you want to change the header but keep the rest of the 30 million lines. Since the new header has the same length, the following will open file for both reading and writing:
Code:
sed -Ee '1s/s([1-4])/L\1/g' -e '1s/s([5-8])/W\1/g' -e '1y/5678/1234/' -e '1q' 0<file 1<>file

This will be very fast and replace the file in place. Be careful.
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cgiSetHeader(3) 						Programmer's Manual						   cgiSetHeader(3)

NAME
cgiSetHeader - Specify an additional HTTP header SYNOPSYS
#include <cgi.h> int cgiSetHeader (char *name, char *value); DESCRIPTION
With the cgiSetHeader routine you may specify additional HTTP header lines such as Expires: or Pragma:. The order of header lines withing the HTTP header has no significance. You may call this routine multiple times to set multiple headers. They will be printed in the same order as specified, however, after the Content-type: header. This routine will only add the header to the internal stack, not print it. They will be printed by cgiHeader(3). This routine does some syntax checking before accepting a new header. The name of a header must not contain any newline, space or colon, otherwise it will be truncated. The value must not contain any newline, otherwise it will be truncated as well. To set a cookie in your program you'll need to manually add additional header lines. Please take a look at cgitest.c. Basically, you'll need to add the following code: cgiSetHeader ("Set-Cookie", "Version=1; name=value; Path=/"); cgiHeader(); Please read the included file cookies.txt as well. RETURN VALUE
On success 1 is returned, otherwise 0. AUTHOR
This CGI library is written by Martin Schulze <joey@infodrom.org>. If you have additions or improvements please get in touch with him. SEE ALSO
cgiHeader(3), cgiGetCookies(3), cgiGetCookie(3), cgiInit(3). CGI Library 6 April 2008 cgiSetHeader(3)
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