c program help

hi all
i have to write some script in c program
i tried this

Code:

//cc simple.c -o simple
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{

char bb=system("cat file.txt | sed -n '/Underlying Value/,/]Top/p' | egrep -v 'Underlying Value|]Top' | sed 's/\[[0-9]\{1,\}\]//g' > /home/munna/Desktop/munna.txt");
printf("******** %s \n",bb);

  return 0;
}

and the file.txt is

[1]Home > [2]F&O >
Watch

All contracts of NIFTY
As on Hours IST

Instrument Type Underlying Expiry Date Option Type High
Price Low Prev Close of contracts traded
Turnover Lakhs Underlying Value

[5]AAAAA [6]GGGGGG [7]25OC200 - - 5389.80 5203.10 5673.15 5255.00
89085 234115.83 5143.90
[8]AAAAA [9]GGGGGG [10]29NO2007 - - 5389.00 5211.00 5674.00 5269.95
5265 13869.14 5143.90
[11]BBBBBB [12]GGGGGG [13]25OC200 [14]CE [15]5600.00 74.00 15.00
168.60 34.05 810 2281.01 5143.90
[16]AAAAA [17]GGGGGG [18]27DE200 - - 5410.00 5125.00 5664.05 5265.00
694 1828.64 5143.90

[243]Top

[1]http://www.google.com/
[2]http://www.google.com/
[7]http://www.google.com/
[79]http://www.yahoo.com/
[2447]http://www.google.com/
[700]http://www.yahoo.com/

but this program saying some errors like

simple.c:9: warning: unknown escape sequence '\}'
simple.c:9: warning: unknown escape sequence '\]'

i wanna output in a string "bb".

please help me

thank you in advance

You've got to escape the backslashes.

Originally Posted by CornedBee

You've got to escape the backslashes.

how can i do?

please help me

thank you in advance

To get one backslash in a string, you need two backslashes, one to say "The next character is special, and the second to say 'I want a backslash'" - this is because backslash is already used as a "the next character is special", and the compiler needs the next char to say what special character you want (such as newline, backspace, or in this case a backslash).

--
Mats