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Shell script in Sys/Bios

Hi , 

can shell script be executed in the sys/bios ??

I have a c++ program  which  finds a value from a text file and parse it to a variable using the shell script . On running the same program in the sys/bios environment am getting error pclose() & popen() that executes the shell commands are undefined. 

#include <stdio.h> is included in the program .