Здравствуйте.
Помогите пожалуйста найти ошибку в коде
| Код |
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <netinet/in.h>
#include <resolv.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
/*
*
*/
int main (int argv, char** argc)
{
int pfildes[2];
pid_t pid;
if (pipe(pfildes) == -1) {perror("error creating pipe"); exit(1);}
if ((pid = fork()) == -1) {perror("error creating child process"); exit(1);}
else if (pid == 0) { /* child: */
close(pfildes[0]); /* close read end of pipe */
dup2(pfildes[1], 1); /* make 1 same as write-to end of pipe */
close(pfildes[1]); /* close excess fildes */
execlp("ls", "-1", NULL);
perror("error executing child process"); /* still around? exec failed */
_exit(1); /* no flush */
}
else { /* parent: */
int status;
waitpid(pid, &status, 0);
if (WIFEXITED(status))
{
printf("[ls] executed ok");
}
else
{
perror("error executing child process");
}
close(pfildes[1]); /* close write end of pipe */
dup2(pfildes[0],0); /* make 0 same as read-from end of pipe */
close(pfildes[0]); /* close excess fildes */
execlp("cut", "-c", "44-56", NULL);
perror("error executing child process"); /* still around? exec failed */
exit(1);
}
}
|
Хочу запустить этим кодом вот такую сложную команду
| Цитата |
ls -l | cut -c 44-56
|
пробую запустить, но получаю
| Цитата |
-c: you must specify a list of bytes, characters, or fields
Try `-c --help' for more information.
|
|
