命令 sed 上下文寻址未按预期工作

Question

我有一个文本文件

file.txt

，内容为：

lord
blue
bird
The sky
reptile
lorwood
wood

我正在尝试使用命令

sed

和基本正则表达式来打印“lord”和“reptile”之间的行：

$ sed -n '/^lor/,/^rep/p' file.txt

但是，它会打印整个文件，就像

cat

一样。为什么？

我使用的

sed

版本是：

$ sed --version
sed (GNU sed) 4.8
Packaged by Debian
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Jay Fenlason, Tom Lord, Ken Pizzini,
Paolo Bonzini, Jim Meyering, and Assaf Gordon.

This sed program was built with SELinux support.
SELinux is disabled on this system.

GNU sed home page: <https://www.gnu.org/software/sed/>.
General help using GNU software: <https://www.gnu.org/gethelp/>.
E-mail bug reports to: <[email protected]>.

Answer 1

紧接着

lor

行之后还有第二个

rep

行，因此 sed 将

lord

打印到

reptile

，然后打印

lorwood

直到文件末尾。