Chinaunix

标题: 如何去掉文本最后一行的最后一个字符 [打印本页]

作者: 我是一个小啊小菜鸟 时间: 2016-04-27 09:12
标题: 如何去掉文本最后一行的最后一个字符
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

作者: haooooaaa 时间: 2016-04-27 09:18

sed '$s/,$//'

复制代码

作者: mswsg 时间: 2016-04-27 09:25
python remove_last.py --input your_input_file > out.txt
将下面的代码保存为remove_last.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'shengwei ma'
__author_email__ = 'shengweima@icloud.com'
import sys
import getopt
input_file = ""
try:
opts, args = getopt.getopt(sys.argv[1:], "h", ["input="])
except getopt.GetoptError as err:
print(str(err))
for op, value in opts:
if op == "--input":
input_file = value
elif op == "-h":
print("python remove_last.py --input your_input_file > out.txt")
sys.exit()
with open(input_file, 'r') as f:
lines = f.read().strip()
print lines[:-1]

复制代码

作者: 我是一个小啊小菜鸟 时间: 2016-04-27 09:26
谢谢回复 2# haooooaaa

作者: 我是一个小啊小菜鸟 时间: 2016-04-27 09:27
谢谢，没sed好用啊，您这个很强大，但是我看不懂回复 3# mswsg

作者: mswsg 时间: 2016-04-27 09:30
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

作者: sync_1521 时间: 2016-04-27 09:33
awk '{sub(",$","")}1' file

作者: elu_ligao 时间: 2016-04-27 09:51
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

作者: sync_1521 时间: 2016-04-27 10:43
回复 8# elu_ligao

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

复制代码

作者: jcdiy0601 时间: 2016-04-28 10:32
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"}

作者: sunzhiguolu 时间: 2016-04-28 12:50

perl -nle '{if($.>1){print $s}$s=$_}END{print substr($s,0,-1)}' file

复制代码

作者: tolilong 时间: 2016-04-28 13:37
awk -F"}" '{print $1"}"}' filename

作者: xdsnet 时间: 2016-04-28 14:25
楼主是要最后一行的最后一个逗号，而不是每行的逗号啊。

作者: 龙神add 时间: 2016-05-01 23:57
sed 's/,$//g' filename
比较简单

作者: 龙神add 时间: 2016-05-01 23:57
这是python?

欢迎光临 Chinaunix (http://bbs.chinaunix.net/)