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Top Forums Shell Programming and Scripting insert a header in a huge data file without using an intermediate file Post 302286257 by deepaktanna on Tuesday 10th of February 2009 03:38:21 PM
Old 02-10-2009
Question insert a header in a huge data file without using an intermediate file

I have a file with data extracted, and need to insert a header with a constant string, say: H|PayerDataExtract

if i use sed, i have to redirect the output to a seperate file like

Code:
sed ' sed commands' ExtractDataFile.dat > ExtractDataFileWithHeader.dat

the same is true for awk

and in its simplist form i could say
Code:
echo 'H|PayerDataExtract' > ExtractDataFileWithHeader.dat
 cat ExtractDataFile.dat >> ExtractDataFileWithHeader.dat
 mv ExtractDataFileWithHeader.dat ExtractDataFile.dat

but in all of the above an extra file is created. If i were to do this in vi manually the extra file could be avoided.

Is there a way to avoid the extra file while still not having to manually use vi in a interactive manner? This is even more neccessary if the file uses over 50% filespace and an extra file will just double my usage , though temporarily

Last edited by rbatte1; 12-13-2016 at 09:46 AM.. Reason: Added CODE tags
 

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load_datafile(3alleg4)						  Allegro manual					    load_datafile(3alleg4)

NAME
load_datafile - Loads a datafile into memory. Allegro game programming library. SYNOPSIS
#include <allegro.h> DATAFILE *load_datafile(const char *filename); DESCRIPTION
Loads a datafile into memory in one go. If the datafile has been encrypted, you must first call packfile_password() to set the appropriate key. If the datafile contains truecolor graphics, you must set the video mode or call set_color_conversion() before loading it. Example: /* Load the resources for our game. */ DATAFILE *dat = load_datafile("game.dat"); if (!dat) abort_on_error("Couldn't load sound resources!"); /* Use resources. */ ... /* Destroy them when we don't need them any more. */ unload_datafile(dat); RETURN VALUE
Returns a pointer to the DATAFILE, or NULL on error. Remember to free this DATAFILE later to avoid memory leaks. SEE ALSO
load_datafile_callback(3alleg4), unload_datafile(3alleg4), load_datafile_object(3alleg4), set_color_conversion(3alleg4), fixup_datafile(3alleg4), packfile_password(3alleg4), find_datafile_object(3alleg4), register_datafile_object(3alleg4), excustom(3alleg4), exdata(3alleg4), exexedat(3alleg4), exgui(3alleg4), exsprite(3alleg4), exunicod(3alleg4) Allegro version 4.4.2 load_datafile(3alleg4)
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