如何在从文件中获取的内容中转义双引号

Question

从statusfile.logto添加内容时，我试图转义双引号statusfile_truncated.log。

我环顾四周，只是越来越困惑。你将如何实现它？

这是我到目前为止得到的：

#!/bin/bash

statusfile="statusfile.log"
statusfile_truncated="statusfile_truncated.log"
tail -n 50 $statusfile >> $statusfile_truncated

statusfile.log 的内容：

2017-05-15 22:36:18 test.somedomain.com <--- 250 CWD successful. "/xxxxxxxxxxxxx" is current directory.
2017-05-15 22:36:18 test.somedomain.com <--- 250 CWD successful. "/xxxxxxxxxxxxx" is current directory.
2017-05-15 22:36:18 test.somedomain.com <--- 250 CWD successful. "/xxxxxxxxxxxxx" is current directory.

statusfile_truncated.log 的内容应该是：

2017-05-15 22:36:18 test.somedomain.com <--- 250 CWD successful. \"/xxxxxxxxxxxxx\" is current directory.
2017-05-15 22:36:18 test.somedomain.com <--- 250 CWD successful. \"/xxxxxxxxxxxxx\" is current directory.
2017-05-15 22:36:18 test.somedomain.com <--- 250 CWD successful. \"/xxxxxxxxxxxxx\" is current directory.

Answer 1

我只想在双引号前面插入一个反斜杠，你可以sed这样使用：

sed 's/"/\\"/g' $statusfile >> $statusfile_truncated

但是，如果要进行真正的逃避，则应考虑其他工具和技术。