Bash 将输出重定向到 tty 和文件
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Bash redirect output to tty and file
提问by Dejwi
I'm trying to log some part of script execution. Logs should be displayed at second tty, and also written to a log file.
我正在尝试记录脚本执行的某些部分。日志应显示在第二个 tty，并写入日志文件。
I can do it with a simple:
我可以用一个简单的方法来做到：
echo "Hello log" > /dev/tty2
echo "Hello log" > /var/log/my_logs
But it is very uncomfortable. I could also redirect echo to a particular place:
但是很不舒服。我还可以将 echo 重定向到特定位置：
exec 1<>/var/log/my_logs
exec 2>&1
But how can I redirect STDOUT to both /dev/tty2 and /var/log/my_logs at once?
但是我怎样才能同时将 STDOUT 重定向到 /dev/tty2 和 /var/log/my_logs 呢？
回答by chepner
Use tee.
使用tee.
echo "Hello log" | tee /dev/tty2 /var/log/my_logs > /dev/null
(The final redirection is to prevent the output from appearing to standard output as well. You could also use echo "Hello log" | tee /dev/tty2 > /var/log/my_logs; there's no real difference between the two. teejust writes it standard input to both standard output and one or more named files.)
（最后的重定向是为了防止输出也出现在标准输出中。您也可以使用echo "Hello log" | tee /dev/tty2 > /var/log/my_logs; 两者之间没有真正的区别。tee只需将其标准输入写入标准输出和一个或多个命名文件。）
To redirect all of standard output to the pair, use a process substitution with exec.
要将所有标准输出重定向到该对，请使用带有exec.
exec > >(tee /dev/tty2 /var/log/my_logs)
