用sed对已知单词进行区分大小写的替换

Question

我需要用sed替换一组已知的单词,但我必须保持原始单词的区分大小写.例如,"Abc"替换为"Def",但"abc"替换为"def".只有单词的第一个字母可以有所不同(因此不允许使用aBC或abC单词).

我知道如何使用每个单词2个正则表达式来完成此操作,但是每个单词只能使用1个正则表达式吗？

Answer 1

您可以编写脚本的创建sed。假设一个单词对文件：

$ cat words.dat
apple pecan
banana walnut
cherry almond

和一个文本文件：

$ cat textfile.txt
apple
banana
cherry
I would like an apple pie. Cherry pies are good, too. What about bananas?
Bananas are full of potassium.

你可以做：

awk '{print "s/" tolower($1) "/" tolower($2) "/g;s/" toupper(substr($1,1,1)) tolower(substr($1,2)) "/" toupper(substr($2,1,1)) tolower(substr($2,2)) "/g"}' words.dat > sedscript.sed

剧本sed：

$ cat sedscript.sed
s/apple/pecan/g;s/Apple/Pecan/g
s/banana/walnut/g;s/Banana/Walnut/g
s/cherry/almond/g;s/Cherry/Almond/g

进而：

$ sed -f sedscript.sed textfile.txt
pecan
walnut
almond
I would like an pecan pie. Almond pies are good, too. What about walnuts?
Walnuts are full of potassium.