从多个文件中删除线，sed命令 [英] Removing lines from multiple files with sed command

问题描述

因此​​，免责声明：我是pretty新的使用bash和zsh的，所以有机会的话，答案是非常简单的。然而。我检查previous帖子，但没有找到任何东西。 （编辑：我已经在这两个bash和zsh的shells-同样的问题，尝试这样做）

So, disclaimer: I am pretty new to using bash and zsh, so there is a chance the answer is really simple. Nonetheless. I checked previous postings and couldn't find anything. (edit: I have tried this in both bash and zsh shells- same problem.)

我有很多文件的目录，我试图删除每个文件的第一行。

I have a directory with many files and am trying to remove the first line from each file.

所以说，该目录包含：FILE1.TXT FILE2.TXT file3.txt ...等

So say the directory contains: file1.txt file2.txt file3.txt ... etc.

我使用sed命令（非GNU）：

I am using the sed command (non-GNU):

sed -i -e "1d" *.txt

有关某些原因，这只是除去第一文件的第一行。我认为，* .TXT会影响到匹配的目录模式中的所有文件。奇怪的是，它是创建具有-e所附文件重复，但无论是重复的和原来是相同的。

For some reason, this is only removing the first line of the first file. I thought that the *.txt would affect all files matching the pattern in directory. Strangely, it is creating the file duplicates with -e appended, but both the duplicate and original are the same.

我想这与其他命令（例如LS * .TXT），它工作正常。是否有一些关于sed的我失踪？

I tried this with other commands (e.g. ls *.txt) and it works fine. Is there something about sed I am missing?

感谢您提前。

推荐答案

在不同的操作系统，不同版本的 SED 的支持各种参数。

Different versions of sed in differing operating systems support various parameters.

的 -i 标记为不可用。您可以使用以下 / bin / sh的语法：

The -i flag is unavailable. You can use the following /bin/sh syntax:

for i in *.txt
do
    f=`mktemp -p .` 
    sed -e "1d" "${i}" > "${f}" && mv -- "${f}" "${i}"
done

的FreeBSD（11-CURRENT）SED

的 -i 标志要求延期，即使它是空的。因此，必须写成 SED -i，-e1d中的* .txt

FreeBSD (11-CURRENT) sed

The -i flag requires an extension, even if it's empty. Thus must be written as sed -i "" -e "1d" *.txt

这看起来看到，如果参数如下 -i 是另一种选择（或可能的命令）。如果是这样，它假定在就地改性。如果这似乎是一个文件扩展名，如 .bak的，将重命名原始的 .bak的，然后对其进行修改成原始文件的名称

This looks to see if the argument following -i is another option (or possibly a command). If so, it assumes an in-place modification. If it appears to be a file extension such as ".bak", it will rename the original with the ".bak" and then modify it into the original file's name.

有可能会在其他平台上的其他变化，但这些都是三我手边。

There might be other variations on other platforms, but those are the three I have at hand.

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