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標(biāo)題: 如何去掉文本最后一行的最后一個字符 [打印本頁]

作者: 我是一個小啊小菜鳥 時間: 2016-04-27 09:12
標(biāo)題: 如何去掉文本最后一行的最后一個字符
請大神幫忙下，最近接觸文本處理遇見了問題

{"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"},

現(xiàn)在我想把最后一行結(jié)尾的逗號（,）去掉，sed該怎么寫啊

作者: haooooaaa 時間: 2016-04-27 09:18

sed '$s/,$//'

復(fù)制代碼

作者: mswsg 時間: 2016-04-27 09:25
python remove_last.py --input your_input_file > out.txt
將下面的代碼保存為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]

復(fù)制代碼

作者: 我是一個小啊小菜鳥 時間: 2016-04-27 09:26
謝謝回復(fù) 2# haooooaaa

作者: 我是一個小啊小菜鳥 時間: 2016-04-27 09:27
謝謝，沒sed好用啊，您這個很強大，但是我看不懂回復(fù) 3# mswsg

作者: mswsg 時間: 2016-04-27 09:30
沒事，你這種單個文件的當(dāng)然大材小用了。回復(fù) 5# 我是一個小啊小菜鳥

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

作者: elu_ligao 時間: 2016-04-27 09:51
回復(fù) 7# sync_1521

這個會把所有以, 結(jié)尾的, 都去掉吧，不是最后一行的, 哦

作者: sync_1521 時間: 2016-04-27 10:43
回復(fù) 8# elu_ligao

沒細(xì)看。。想當(dāng)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

復(fù)制代碼

作者: jcdiy0601 時間: 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 時間: 2016-04-28 12:50

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

復(fù)制代碼

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

作者: xdsnet 時間: 2016-04-28 14:25
樓主是要最后一行的最后一個逗號，而不是每行的逗號啊。

作者: 龍神add 時間: 2016-05-01 23:57
sed 's/,$//g' filename
比較簡單

作者: 龍神add 時間: 2016-05-01 23:57
這是python?

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