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diff --git a/lab5_shelllab/myint.cc b/lab5_shelllab/myint.cc
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+/*
+ * myint.c - Another handy routine for testing your tiny shell
+ *
+ * usage: myint <n>
+ * Sleeps for <n> seconds and sends SIGINT to itself.
+ *
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+int main(int argc, char **argv)
+{
+ int i, secs;
+ pid_t pid;
+
+ if (argc != 2)
+ {
+ fprintf(stderr, "Usage: %s <n>\n", argv[0]);
+ exit(0);
+ }
+ secs = atoi(argv[1]);
+
+ for (i = 0; i < secs; i++)
+ sleep(1);
+
+ pid = getpid();
+
+ if (kill(pid, SIGINT) < 0)
+ fprintf(stderr, "kill (int) error");
+
+ exit(0);
+}