如何去掉文本最后一行的最后一个字符

我是一个小啊小菜鸟

请大神帮忙下，最近接触文本处理遇见了问题

{"X":40.172819,"Y":116.383621,"Z":.0117,"T":"2016-04-26 16:00:00"},
{"X":39.760256,"Y":116.305211,"Z":.2923,"T":"2016-04-26 16:00:00"},
{"X":39.959291,"Y":116.32090099999999,"Z":.3288,"T":"2016-04-26 16:00:00"},
{"X":40.019980999999994,"Y":116.339131,"Z":.2475,"T":"2016-04-26 16:00:00"},
{"X":39.983142,"Y":116.303713,"Z":1.155,"T":"2016-04-26 16:00:00"},

现在我想把最后一行结尾的逗号（,）去掉，sed该怎么写啊

haooooaaa

1. sed '$s/,$//'

复制代码

mswsg

python remove_last.py --input your_input_file > out.txt
将下面的代码保存为remove_last.py

1. #!/usr/bin/env python
   
2. # -*- coding: utf-8 -*-
   
3. __author__ = 'shengwei ma'
   
4. __author_email__ = 'shengweima@icloud.com'
   
5. import sys
   
6. import getopt
   
7. 
   
8. input_file = ""
   
9. 
   
10. try:
    
11.    opts, args = getopt.getopt(sys.argv[1:], "h", ["input="])
    
12. except getopt.GetoptError as err:
    
13.     print(str(err))
    
14. for op, value in opts:
    
15.     if op == "--input":
    
16.         input_file = value
    
17.     elif op == "-h":
    
18.         print("python remove_last.py --input your_input_file > out.txt")
    
19.         sys.exit()
    
20. 
    
21. with open(input_file, 'r') as f:
    
22.     lines = f.read().strip()
    
23.     print lines[:-1]

复制代码

我是一个小啊小菜鸟

谢谢回复 2# haooooaaa


   

我是一个小啊小菜鸟

谢谢，没sed好用啊 ，您这个很强大，但是我看不懂回复 3# mswsg


   

mswsg

没事，你这种单个文件的当然大材小用了。回复 5# 我是一个小啊小菜鸟


   

sync_1521

awk '{sub(",$","")}1' file

elu_ligao

回复 7# sync_1521


    这个会把所有以, 结尾的, 都去掉吧， 不是最后一行的, 哦

sync_1521

回复 8# elu_ligao

1. 没细看。。想当然了
   
2. awk '{if(s){print s};s=$0}END{sub(",$","");print}' file
   
3. awk 'NR==FNR{n=NR;next}FNR==n{sub(",$","")}1' file file

复制代码

jcdiy0601

sed 's/.$//' file
{"X":40.172819,"Y":116.383621,"Z":.0117,"T":"2016-04-26 16:00:00"}
{"X":39.760256,"Y":116.305211,"Z":.2923,"T":"2016-04-26 16:00:00"}
{"X":39.959291,"Y":116.32090099999999,"Z":.3288,"T":"2016-04-26 16:00:00"}
{"X":40.019980999999994,"Y":116.339131,"Z":.2475,"T":"2016-04-26 16:00:00"}
{"X":39.983142,"Y":116.303713,"Z":1.155,"T":"2016-04-26 16:00:00"}

awk '{sub(/.$/,"")}1' file
{"X":40.172819,"Y":116.383621,"Z":.0117,"T":"2016-04-26 16:00:00"}
{"X":39.760256,"Y":116.305211,"Z":.2923,"T":"2016-04-26 16:00:00"}
{"X":39.959291,"Y":116.32090099999999,"Z":.3288,"T":"2016-04-26 16:00:00"}
{"X":40.019980999999994,"Y":116.339131,"Z":.2475,"T":"2016-04-26 16:00:00"}
{"X":39.983142,"Y":116.303713,"Z":1.155,"T":"2016-04-26 16:00:00"}