使用SED在文件中进行文本转换

Question

Given the csv file called address.txt :

Buddy,Guy,49085
Otis,Rush,60194

How can I convert the file to just contain the zip code? My commandline test is not working and I am not sure why. I am getting the untransformed text returned from cat

cat address.txt | sed  's/\(.+\),\(.+\),\(.+\)/\3/g'

Answer 1

This does it:

cat address.txt | sed  's/[^,]*,[^,]*,\([^,]*\)/\1/'

It's easier in sed to describe what the pattern should not contain VS. what it should, at least for this problem

Answer 2

做到这一点（使用GNU sed）：

sed -r 's/.+,(.+)/\1/' address.txt

Answer 3

sed 's/.*,//' address.txt

要么

awk -F, '{print $NF}' address.txt