void main()
{
char comando[2000];
char resultado[500]
sprintf(comando, "grep '[0-9]{50}-' input.txt);
resultado = system(comando);
printf("%s\n",resultado);
}
I need only 1 match, and return the value in result, the above code does not compile, it's just an example of how you'd like it to be.
#include <stdio.h>
#include <stdlib.h>
FILE *popen(const char *command, const char *mode);
int pclose(FILE *stream);
int main(void)
{
FILE *cmd;
char result[1024];
cmd = popen("grep bar /usr/share/dict/words", "r");
if (cmd == NULL) {
perror("popen");
exit(EXIT_FAILURE);
}
while (fgets(result, sizeof(result), cmd)) {
printf("%s", result);
}
pclose(cmd);
return 0;
}