如何将nohup输出重定向到指定文件? [英] How can I redirect nohup output to a specified file?

问题描述

我在SO上发现的其他示例中尝试的所有内容似乎都不起作用.我试图使用nohup运行我的应用程序，但将应用程序的输出附加到文件中.

Everything I have tried from other examples I have found on SO don't seem to work. I am trying to run my application using nohup but append the output of the application to a file.

我尝试了以下一些方法.似乎都不起作用.

I have tried some of the following. None of which seem to work.

nohup dotnet application.dll &> out.log &
nohup dotnet application.dll > out.log 2>&1 &
nohup dotnet application.dll > /opt/out.log &

我总是收到类似的东西

-bash: out.log: Permission denied

我尝试使用sudo运行该应用程序，但它似乎仍然无法正常工作.

I have tried running the application using sudo but it still doesn't seem to work.

nohup dotnet application.dll &

效果很好，但是它将输出定向到其他目录，例如/home/ubuntu/nohup.out

Works fine, but it directs the output to some other directory like /home/ubuntu/nohup.out

我在做什么错了?

推荐答案

nohup dotnet application.dll>out.log 2>& 1& 是正确的格式.

>out.log 将STDOUT重定向到文件 out.log .

> out.log redirects STDOUT to the file out.log.

2>& 1 将fd2(STDERR)重定向到fd1(STDOUT)，该文件已经重定向到文件 out.log .

2>&1 redirects fd2 (STDERR) to fd1 (STDOUT), which is already redirected to the file out.log.

您的问题出在文件权限(或只读文件系统)上.在命令前面加上 sudo 不能解决此问题，因为 sudo 仅以root身份执行 nohup dotnet application.dll ，因此输出重定向为由bash使用您的普通用户权限来完成.您可以通过使用root特权调用单独的shell来解决此问题:

Your problem lies in the file permissions (or a read-only filesystem). Prepending sudo to your command can't fix this, because only nohup dotnet application.dll is executed as root by sudo, the output redirection is done by bash with your normal user privileges. You can work around this by calling a separate shell with root privileges:

sudo sh -c 'nohup dotnet application.dll > out.log 2>&1 &'

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