init commit

3sem/seminars/l10/01.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <wait.h>
+
+// cmd < file1 >> file2
+
+int
+main(int argc, char **argv)
+{
+    char *file1 = argv[2];
+    char *file2 = argv[3];
+    char *cmd = argv[1];
+
+    if (!fork()) {
+        int fin = open(file1, O_RDONLY);
+        int fout = open(file2, O_WRONLY | O_APPEND | O_CREAT, 0666);
+
+        dup2(fin, 0);
+        dup2(fout, 1);
+
+        execlp(cmd, cmd, NULL);
+        _exit(1);
+    } else {
+        wait(NULL);
+    }
+
+    return 0;
+}