bash 运行一个 shell 脚本并立即将其后台运行，但保持检查其输出的能力
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run a shell script and immediately background it, however keep the ability to inspect its output
提问by american-ninja-warrior
How can I run a shell script and immediately background it, however keep the ability to inspect its output any time by tailing /tmp/output.txt
我怎样才能运行一个 shell 脚本并立即将它作为后台运行，但是通过拖尾 /tmp/output.txt 保持随时检查其输出的能力
It would be nice if I can foreground the process too later.
如果我可以太晚地将过程置于前台，那就太好了。
PS It would be really cool if you can also show me how to "send" the backgrounded process in to a gnu screen that may or may not have been initialized.
PS 如果您还可以向我展示如何将后台进程“发送”到可能已初始化或未初始化的 gnu 屏幕，那将非常酷。
回答by Jon Wolski
To 'background' a process when you start it
在启动进程时“背景”它
Simply add an ampersand (&) after the command.
只需&在命令后添加一个与号 ( )。
If the program writes to standard out, it will still write to your console/terminal.
如果程序写入标准输出，它仍将写入您的控制台/终端。
To foreground the process, simply use the fgcommand.
要将进程置于前台，只需使用该fg命令。
(You can see a list of jobs in the background with jobs.)
（您可以在后台查看工作列表jobs。）
for example:
例如：
sh -c 'sleep 3 && echo I just woke up' & jobs
sh -c 'sleep 3 && echo I just woke up' & jobs
To background a currently running process
将当前正在运行的进程设为后台
If you have already started the process in the foreground, but you want to move it to the background, you can do the following:
如果您已经在前台启动了该进程，但您想将其移至后台，则可以执行以下操作：
- Press Ctrl+z to put the current process to sleep and return to your shell. (This process will be paused until you send it another signal.)
- Run the
bgcommand to resume the process, but have it run in the background instead of the foreground.
- 按 Ctrl+z 使当前进程进入睡眠状态并返回到您的 shell。（此过程将暂停，直到您向其发送另一个信号。）
- 运行
bg命令以恢复进程，但让它在后台而不是前台运行。
回答by israelss
Another way is using the nohupcommand with &at the end of the line.
另一种方法是在行尾使用nohup命令&。
Something like this
像这样的东西
nohup whatevercommandyouwant whateverparameters &
This will run it in the background and send its output to a nohup.log file.
这将在后台运行它并将其输出发送到 nohup.log 文件。
