tee和脚本本质上是等效的吗? [英] Are tee and script essentially equivalent?

问题描述

在我要捕获文件中进程的 stdout 但仍要在终端中显示此输出的情况下，我可以在script和tee之间进行选择.在这种情况下，这些工具在本质上是等效的，还是有(可能是微妙的)理由偏爱一种?

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程序script和tee被设计用于不同的目的:

• script-制作终端会话的打字稿
• tee-管道配件

script和tee之间的重要区别是:

• script传送它所监视的进程的退出状态，而tee作为过滤器甚至不知道它.
• script捕获其监视的进程的 stdin ， stdout ， stderr ，而tee仅捕获其过滤的流.

在给定的上下文中，这些差异均不相关.

解决方案

我发现script对于使控制序列在输送到tee时起作用非常有用:

script -q -c 'python -c "import pdb, sys; pdb.set_trace()"' /dev/null \
| tee -a /tmp/tmp.txt

仅使用以下内容，Ctrl-A将显示为^A等:

python -c "import pdb, sys; pdb.set_trace()" | tee -a /tmp/tmp.txt

这是一个最小的示例.我在这里使用tee来捕获pytest测试运行的输出，但有时其中可能存在调试器，然后光标键等应该可以工作.

通过 https://unix.stackexchange.com/a/61833/1920 .

In the context where I want to capture the stdout of a process in a file but still want to have this output displayed in the terminal I can choose between script and tee. In this context, are these tools essentially equivalent or is there a – possibly subtle – reason to prefer one over the other?

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The programs script and tee are designed for different purposes:

• script -- make typescript of terminal session
• tee -- pipe fitting

Important differences between script and tee are:

• script transmits the exit status of the process it supervises, while tee, being a filter, does not even know about it.
• script captures stdin, stdout, stderr of the process it supervises while tee only catches the stream it filters.

None of these differences are relevant in the given context.

解决方案

I found script to be useful for making control sequences work when piping to tee:

script -q -c 'python -c "import pdb, sys; pdb.set_trace()"' /dev/null \
| tee -a /tmp/tmp.txt

With only the following, Ctrl-A would be displayed as ^A etc:

python -c "import pdb, sys; pdb.set_trace()" | tee -a /tmp/tmp.txt

This is a minimal example. I am using tee here to capture the output from a pytest test run, but sometimes there might be a debugger in there, and cursor keys etc should work then.

Via https://unix.stackexchange.com/a/61833/1920.

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