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如何在bash脚本中判断输入输出是否被重定向到文件

 2 years ago
source link: https://www.lujun9972.win/blog/2018/04/26/%E5%A6%82%E4%BD%95%E5%9C%A8bash%E8%84%9A%E6%9C%AC%E4%B8%AD%E5%88%A4%E6%96%AD%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA%E6%98%AF%E5%90%A6%E8%A2%AB%E9%87%8D%E5%AE%9A%E5%90%91%E5%88%B0%E6%96%87%E4%BB%B6/index.html
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如何在bash脚本中判断输入输出是否被重定向到文件

使用 -t FD 能判断文件描述符FD是否与终端相连，因此 

if [[ -t 0 ]];then
    echo "stdin is a terminal"
else
    echo "stdin is not a terminal"
fi

if [[ -t 1 ]];then
    echo "stdout is a terminal"
else
    echo "stdout is not a terminal"
fi

if [[ -t 2 ]];then
    echo "stderr is a terminal"
else
    echo "stderr is not a terminal"
fi

stdin is not a terminal stdout is not a terminal stderr is not a terminal


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