BSD sed:d 命令末尾的额外字符 [英] BSD sed: extra characters at the end of d command

问题描述

我在 mac OS 上使用 sed 命令，下面是正文.

I use sed command on mac OS, following is the text.

$ cat pets.txt 
This is my cat
  my cat's name is betty
This is your dog
  your dog's name is frank
This is your fish
  your fish's name is george
This is my goat
  my goat's name is adam

当我运行时:(BSD sed)

when I run: (BSD sed)

$ sed '3,6 {/This/d}' pets.txt

显示错误:

sed: 1: "3,6 {/This/d}": extra characters at the end of d command

这是怎么回事?当我使用 gsed(GNU sed) 时，效果很好.

what's wrong with it? when I use gsed(GNU sed), it works well.

推荐答案

最简单的解决方案是在 d 后面加一个分号(显示的空格是可选的):

The simplest solution is to put a semi-colon after the d (the spaces shown are optional):

sed -e '3,6 { /This/d; }' pets.txt

BSD sed 在布局方面比 GNU sed 更加挑剔.有许多 GNU 扩展不是 BSD sed 的一部分，这就是其中之一.分号不是问题的通用解决方案，尽管它确实解决了许多问题.您还可以将命令分布在多行中，或者将它们放在多个 -e 选项中，或者各种其他技巧".

BSD sed is fussier about the layout than GNU sed. There are a number of GNU extensions that are not part of BSD sed, and this is one. The semi-colon isn't the universal solution to problems, though it does solve many of them. You could also spread the commands out over multiple lines, or put them in multiple -e options, or various other 'tricks'.

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