I would like to make a expect script which can answer the question by using srand functuon.
For example, I will use netcat to connect to the server, and I will get a question from server like "please enter 0 or 1"; then I hope my script can answer the question automatically by using the code like above.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
void main(){
int num;
srand(time(NULL));
num=(rand()%2);
printf("%d\n",num);}
If you can provide me some sample, it will be very helpful. Thank you very much.
You want to launch netcat, recognize that text, then return a random value in (0,1), yes?
#!/usr/bin/env expect
expr {srand([clock seconds])} ;# initialize RNG
spawn netcat 127.0.0.1
expect "please enter 0 or 1"
send "[expr {int(rand() * 2)}]\r"
expect eof
See documentation: http://tcl.tk/man/tcl8.6/TclCmd/expr.htm and http://tcl.tk/man/tcl8.6/TclCmd/mathfunc.htm
Tcl's expr
command gets some flak for being a standalone mini-language inside Tcl. The syntax can be ... cleaned up somewhat.
#!/usr/bin/env expect
namespace import ::tcl::mathfunc::*
namespace import ::tcl::mathop::\*
srand [clock seconds] ;# initialize RNG
spawn netcat 127.0.0.1
expect "please enter 0 or 1"
send "[int [* 2 [rand]]]\r"
expect eof
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.