在bash中sed重写同一文件[重复]

Question

我想删除文件的标题，并替换同一文件中没有标题的内容。

示例：file_student

name age
XYS 24
RTF 56

输出应该是：

XYS 24
RTF 56

情况是我不想为此更改创建任何新文件。se可以这样做吗？

我尝试了：

sed 1d /tmp/file_student.txt |
hadoop fs -copyfromLocal /tmp/file_student.txt /tmp/file_student_no_header.txt

但这不起作用。感谢您的帮助！

Answer 1

如果您不想使用se，请尝试ail-例如，您有一个名为xxx的文件：

<代码>尾巴-n 2 xxx

Answer 2

sed的手册页摘录

-i[SUFFIX]'-in-place[=SUFFIX]'此选项指定要在位编辑的文件。GNU“sed”通过创建一个临时文件并将输出发送到此文件而不是标准输出来实现这一点。(1).

 This option implies `-s'.

 When the end of the file is reached, the temporary file is renamed
 to the output file's original name.  The extension, if supplied,
 is used to modify the name of the old file before renaming the
 temporary file, thereby making a backup copy(2)).

 This rule is followed: if the extension doesn't contain a `*',
 then it is appended to the end of the current filename as a
 suffix; if the extension does contain one or more `*' characters,
 then _each_ asterisk is replaced with the current filename.  This
 allows you to add a prefix to the backup file, instead of (or in
 addition to) a suffix, or even to place backup copies of the
 original files into another directory (provided the directory
 already exists).

 If no extension is supplied, the original file is overwritten
 without making a backup.

因此，您需要将您的se命令更改为sed-i 1d file|任何希望这有所帮助。