---- m.roth@5-cent.us wrote:
Steve wrote:
Suppose I have this C++ program: #include <iostream> int main (int argc, char** argv) { while (1) { char cmd[80]; std::cin.getline(cmd, 80); std::cout << "response to " << cmd << std::endl; } }
compiled by: c++ -o junk junk.cpp
and I have this bash script: #!/bin/bash ./junk <<EOF blah bleh \cC EOF echo "Something else"
When I run the script, the program starts and waits for input forever. I have 2 questions:
- The "blah" and "bleh" line are not echoed to cout. Why not? Does the
here document not send the data to stdin? 2) How do I terminate the program? When run interactively, I use <ctrl>-C.
I've only done a tiny bit of C++, but a bunch of years of C. First, I think the \cC is doing something odd; in vi, I'd have tried typing it in with <ctrl-v><ctrl-c>. Second, do you want the output to be "blah bleh"?
I have also tried with <ctrl-V><ctrl-C> and got the same results.
Finally, I am *very* strongly *not* a fan of while. If I have to use it, I set *some* limit - in this case, I'd look for an end-of-file, or some word you decide for "stop here".
As the old joke goes, about hunting elephants in Africa, a programmer sets up a search patter up, across, up, back, starting in Capetown and ending in Cairo.
The *experienced* programmer puts an elephant in the zoo in Cairo to ensure termination of the loop.
My junk program is a quick-and-dirty simulation if the actual program I am trying to use. I do not have the code for the program and all I know is that it responds to command input and the only way to terminate it is with <ctrl-C>. If I run my junk program directly, I get:
$ ./junk blah response to blah bleh response to bleh ^C $
I want to be able to get the same output from the script AND have the script end and not hang waiting for more input.
Steve