检查bash脚本中是否有标准输出重定向 [英] Check if there is an stdout redirection in bash script

问题描述

我需要检查程序的输出是否被重定向；如果是，我需要保留并通过邮件发送.

I need to check if my program's output is being redirected; if yes I need to keep and send its by mail.

示例:

$ myprogram -param1 -param2 -param3 > /home/polly/log.txt

myprogram.sh:

if 'redirection is not empty'; then 
    cat <redirection name> | mailx -s "This is a test email." [e-mail] 
fi 

推荐答案

您可以检查stdout是否为终端.当stdout重定向或通过管道传输时，它将不是终端.您可以将test命令与-t选项一起使用以获取以下信息:

You can check if stdout is a terminal. When stdout is redirected or piped it will not be a terminal. You can use the test command with the -t option to get this information:

if [ -t 1 ] ; then
    # stdout is a terminal
else
    # stdout isn't a terminal
fi

来自man test:

  -t FD  file descriptor FD is opened on a terminal

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