可以检查它是否在调用时后台运行的 Shell 脚本 [英] Shell Script That Can Check if it Was Backgrounded at Invocation

问题描述

我编写了一个依赖于其他服务器响应的脚本(使用 wget 提取数据)，我希望它毫无疑问地始终在后台运行.我知道一种解决方案是编写一个包装脚本，该脚本将使用&"来调用我的脚本附加，但我想避免这种混乱.

I have written a script that relies on other server responses (uses wget to pull data), and I want it to always be run in the background unquestionably. I know one solution is to just write a wrapper script that will call my script with an '&' appended, but I want to avoid that clutter.

bash(或 zsh)脚本有没有办法确定它是否是用 ./foo.sh& 调用的，如果不是，退出并重新启动?

Is there a way for a bash (or zsh) script to determine if it was called with say ./foo.sh&, and if not, exit and re-launch itself as such?

谢谢大家！

推荐答案

我不知道怎么做，但是你可以在父脚本中设置变量并在子脚本中检查它:

I do not know, how to do this, but you may set variable in parent script and check for it in child:

if [[ -z "$_BACKGROUNDED" ]] ; then
    _BACKGROUNDED=1 exec "$0" "$@" & exit
fi
# Put code here

适用于 bash 和 zsh.

Works both in bash and zsh.

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