Fast append before string on each new line -

i have couple of pretty large text-files (1 gb each) have 1 generated word on each line. want append string before each of generated words. whether it's java, c#, c, c++, or ruby doesn't matter. while can't program myself, can compile , run it.

example:

file.txt:

aoos ahsd gaata sdffg 

output:

appendaoos appendahsd appendgaata appendsdffg 

any welcome!

depending on tools have available, can use sed, awk or perl:

sed 's/^/append/' inputfile >outputfile awk '{print "append"$0}' inputfile >outputfile perl -pne 's/^/append/' inputfile >outputfile 

if want write own program, can filter programs relatively easy in c:

#include <stdio.h> int main (void) {     int ch, lastch = '\n';     while ((ch = getchar()) != eof) {         if (lastch == '\n') printf ("append");         putchar (ch);         lastch = ch;     }     return 0; } 

just compile as, example, myprog , run:

myprog <inputfile >outputfile