Linux 将按键发送到后台应用程序

如果我有一个命令行程序作为与命令行交互的后台线程（AKA with./program&）执行，我如何向它发送命令？有没有一种方法（比如，使用“管道”）发送字符，就好像它们是在命令行上输入的一样

简化的命令行示例：

无&（正常情况）：

用&（我的案子！）：

ps-e | grep测试程序显示它仍在运行，但现在不能在“kill”命令之外终止

理想情况如下：

~/home/temp> ./testprogram &

~/home/temp> Welcome to Testprogram. Enter command:

~/home/temp> quit

~/home/temp> Command not found.

~/home/temp> quit | /cat/proc/testprogram

~/home/temp> Goodbye!

---

具体如何操作？

您可以使用fg将程序带回来：

~/home/temp> ./testprogram &
Welcome to Testprogram. Enter command:
~/home/temp> ls /tmp  # do whatever else you want to do on the shell
# ... later
~/home/temp> jobs     # what was running?
[1]+  Running                 ./testprogram &
~/home/temp> fg       # Brings testprogram to foreground, does not re-prompt
quit
Goodbye!
~/home/temp>

如果您有多个后台作业，则可以使用“fg%1”“fg%2”选择要对其进行前台处理的作业

注意：通过停止（Ctrl-z）作业，然后在shell提示下键入bg，可以将前景作业放回后台

~/home/temp> ./testprogram &

~/home/temp> Welcome to Testprogram. Enter command:

~/home/temp> quit

~/home/temp> Command not found.

~/home/temp> quit | /cat/proc/testprogram

~/home/temp> Goodbye!

~/home/temp> ./testprogram &
Welcome to Testprogram. Enter command:
~/home/temp> ls /tmp  # do whatever else you want to do on the shell
# ... later
~/home/temp> jobs     # what was running?
[1]+  Running                 ./testprogram &
~/home/temp> fg       # Brings testprogram to foreground, does not re-prompt
quit
Goodbye!
~/home/temp>