2021-10-19 Linux tee 命令读入标准数据然后标准输出同时把数据写入文件，可以在终端上显示的同时保存到文件。

这篇博客介绍了Linux命令`tee`的使用，它能从标准输入读取数据并同时输出到标准输出以及指定的文件。`-a`选项用于追加内容到文件而不是覆盖。默认情况下，再次使用`tee`命令会覆盖原有文件内容。博客还提供了不同错误处理模式的说明，并给出了实际脚本使用的例子。

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一、man tee ，tee - read from standard input and write to standard output and files

命令读入标准数据然后标准输出同时把数据写入文件

TEE(1)                                                                  User Commands                                                                 TEE(1)

NAME
       tee - read from standard input and write to standard output and files

SYNOPSIS
       tee [OPTION]... [FILE]...

DESCRIPTION
       Copy standard input to each FILE, and also to standard output.

       -a, --append
              append to the given FILEs, do not overwrite

       -i, --ignore-interrupts
              ignore interrupt signals

       -p     diagnose errors writing to non pipes

       --output-error[=MODE]
              set behavior on write error.  See MODE below

       --help display this help and exit

       --version
              output version information and exit

   MODE determines behavior with write errors on the outputs:
       'warn' diagnose errors writing to any output

       'warn-nopipe'
              diagnose errors writing to any output not a pipe

       'exit' exit on error writing to any output

       'exit-nopipe'
              exit on error writing to any output not a pipe

       The  default  MODE  for  the -p option is 'warn-nopipe'.  The default operation when --output-error is not specified, is to exit immediately on error
       writing to a pipe, and diagnose errors writing to non pipe outputs.

AUTHOR
       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

二、我这里脚本上用到的地方。