如何提取最近的终端命令的输出？ [英] How to pull the output of the most recent terminal command?

问题描述

我正在构建一个CLI，该CLI在运行时需要最新执行的bash命令的输出。

I'm building a CLI that, when run, requires the output of the most recently executed bash command. Is it possible to pull this output without recomputing the command?

例如，假设我运行 python main.py 并收到此错误：

For example, let's say I run python main.py and receive this error:

File "main.py", line 41
messages_list.insert(0, { "author" : "dummy_author0", "message" : " " } )
                                                                        ^
IndentationError: unindent does not match any outer indentation level

然后我想运行一个命令，该命令会自动提取此错误消息并对其执行某些操作，而无需重新运行 python main.py 。

I'd like to then run a command that automatically pulls this error message and does something with it, without re-running python main.py.

我想运行 command1; command2 可以为 command2 提供一种方法，因为执行以下命令后可以提取 command1 的输出两者都可能被视为一个进程，但是我不确定如何处理。

I'm thinking that running command1; command2 could provide a way for command2 to pull the output of command1 since the execution of both in sequence might be treated as a single process, but I'm not sure how.

推荐答案

外壳（和终端）

我会将命令包装在shell脚本中，该脚本调用脚本命令，例如

I'd wrap the command in a shell-script which calls the script command, e.g.,

• 创建一个临时文件名（取决于系统，但例如使用 mktemp ），


• 使用该临时文件作为脚本的输出，而不是默认的打字稿。
在命令中将

• 传递给 script ，回显退出代码，因为脚本将在shell脚本中向您隐藏


• ，过滤回车符等，例如，其中 script2log 和


• 最后一个过滤后的输出中有一个具有退出代码。使用它作为shell脚本的退出代码

• create a temporary filename (system-dependent, but for example with mktemp),
• use that temporary file as the output for script, rather than the default typescript.
• in the command passed to script, echo the exit-code since script will hide that from you
• in the shell-script, filter out carriage-returns, etc., e.g., with script2log, and
• the last line of the filtered output would have the exit-code. Use that for the exit-code of the shell-script

对于您的CLI程序，使shell脚本接受一个参数，该参数可以告诉shell脚本在哪里写命令的输出。可能是另一个临时文件，避免了将命令输出重定向到文件或管道的问题，从而使输出不再是终端。

For your CLI program, make the shell-script accept a parameter which tells the shell-script where to write the output of the command. Likely that is another temporary file, avoiding the problem of redirecting the output of the command to a file or pipe, making the output no longer a terminal.

使用 script 的Linux变体，可能是这样的：

If you're using the Linux variant of script, it could be something like this:

#!/bin/sh
# $1 = command
# $2 = output
code=0
tempfile=$(mktemp)
trap "rm -f \$tempfile; exit \$code" EXIT INT QUIT HUP
script -q -c "$1; echo \$?" $tempfile
script2log <$tempfile >$2
code=$(tail -n 1 $tempfile)

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