BASH产卵子shell为SSH并继续程序流程 [英] BASH spawn subshell for SSH and continue with program flow

问题描述

我试图写一个自动根据我的位置（家/ campusA / campusB）某些启动任务的shell脚本。我去大学上课在两个不同的校区（因此campusA / campusB）。我的位置是由无线网络，我连接到​​确定。对于这个脚本的目的，我们可以假设，我将连接到这些网络之一，当脚本调用，我的脚本知道我连接到基于对的iwconfig 。

I'm trying to write a shell script that automates certain startup tasks based on my location (home/campusA/campusB). I go to University and take classes in two different campuses (hence campusA/campusB). My location is determined by which wireless network I'm connected to. For the purposes of this script, we can assume that I will be connected to one of these networks when the script is called and my script knows which one I'm connected to based on a call to iwconfig.

这就是我想要它做的：

cat file1 > file2 # always do this, regardless of where I am
if Im at home:
    start tweetdeck, thunderbird, skype

else if Im at campusA:
    activate the login script # I need to login on a webform before I get internet access. 
                              # I have written a script to automate this. 
                              # Wait for this script to finish before doing anything else
    myProg2 & # I want myProg2 running in the background until I shutdown my computer.

else if Im at campusB:
    ssh username@domain # this is the problematic line
    myProg2 & # I want myProg2 running in the background until I shutdown my computer.

start tweetdeck, thunderbird
close the terminal with the "exit" command

问题是，campusB的无线网络是防火墙，授予我上网之后，只有我通过成功SSH用户名@域名后面。一个成功的SSH之后，我需要保持终端窗口活动以保持保持网络连接。如果我关闭终端窗口，我失去互联网连接（这是不好的）。

The problem is that campusB's wireless network is behind a firewall, which grants me internet access ONLY after I successfully ssh by username@domain. After a successful ssh, I need to keep the terminal window active in order to hold keep the internet access. If I close the terminal window, I lose internet access (this is bad).

当我尝试做只是 SSH用户名@域名，脚本将停止，因为我不退出 SSH 命令。我不能 ^ C 出来，这意味着脚本的其余部分永远不会执行。我也有同样的问题，如果我只是关闭终端窗口，企图杀死 SSH 会话。

When I try doing just ssh username@domain, the script stops because I don't exit the ssh command. I can't ^C out of it, which means that the rest of the script is never executed. I also have the same problem if I just close the terminal window in an attempt to kill the ssh session.

一些谷歌搜索给我带来了 子shell ，该我或者使用错误的或者不能用它来解决我的问题。所以，我应该怎么去解决这个问题呢？我倒是AP preciate任何帮助 - 我已经在这一段时间现在我无法找到任何有用的。如果它的确与众不同，我宁愿不储存我的 SSH 密码在脚本

Some googling brought me to subshell, which I'm either using wrong or can't use to solve my problem. So how should I go about solving this problem? I'd appreciate any help - I've been at this for a while now and am unable to find anything helpful. If it makes a difference, I'd rather not store my ssh password in the script

此外，ampersanding的 SSH 调用（ SSH用户名@域名和放大器; ）似乎并没有做任何良好的（任何人都可以解释为什么吗？）

Further, ampersanding the ssh call (ssh username@domain &) doesn't seem to do any good (can anyone explain why?)

感谢您提前

修改

我必须澄清，即SSH连接必须激活为了让我能够访问Internet。因此，当我关闭终端窗口，我需要ssh连接仍然是活动的。

I must clarify, that the ssh connection has to be active in order for me to have internet access. Thus, when I close the terminal window, I need the ssh connection to still be active.

推荐答案

我有这样的循环在6个服务器，通过在后台调用SSH的脚本。在脚本的第一部分，有一个错误行为的供应商的应用程序;应用程序没有'放手'的连接正常。 （在后台用ssh脚本的其他部分工作得很好）。

I had a script that looped on 6 servers, calling via ssh in the background. In 1 part of the script, there was a mis-behaving vendor application; the application didn't 'let go' of the connection properly. (other parts of the script using ssh in background worked fine).

我发现，使用ssh -t -t治愈的问题。也许这可以帮助你。
（队友发现这个在网络上，我们花了这么多时间，我再也没有回去​​读，暗示此文章。我们的系统上的手册页没有给出暗示，这样的事情是可能的）

I found that using ssh -t -t cured the problem. Maybe this can help you too. (a teammate found this on the web, and we had spent so much time, I never went back to read the article that suggested this. The man page on our system gave no hint that such a thing was possible)

希望这有助于。

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