DOS inherited CR-LF line endings (what you’re calling \r\n, just making the ascii characters explicit) from CP/M. CP/M inherited it from the various DEC operating systems which influenced CP/M designer Gary Kildall. CR-LF was used so that the teletype machines would return the print head to the left margin (CR = carriage return), and then … Read more
The strip() method of strings removes whitespace from both ends. set(line.strip() for line in open(‘filename.txt’))
Setup Add the following plugin in pubspec.yaml: dependencies: path_provider: ^1.6.27 Update the version number to whatever is current. And import it in your code. import ‘package:path_provider/path_provider.dart’; You also have to import dart:io to use the File class. import ‘dart:io’; Writing to a text file _write(String text) async { final Directory directory = await getApplicationDocumentsDirectory(); final … Read more
1. Using BufferedReader import java.io.File import java.io.BufferedReader fun main(args: Array<String>) { val bufferedReader: BufferedReader = File(“example.txt”).bufferedReader() val inputString = bufferedReader.use { it.readText() } println(inputString) } 2. Using InputStream Read By Line import java.io.File import java.io.InputStream fun main(args: Array<String>) { val inputStream: InputStream = File(“example.txt”).inputStream() val lineList = mutableListOf<String>() inputStream.bufferedReader().forEachLine { lineList.add(it) } lineList.forEach{println(“> ” + … Read more
echo “my line” > newFile.txt type myOriginalFile.txt >> newFile.txt type newFile.txt > myOriginalFile.txt Untested. Double >> means ‘append’
You can use file locking: import fcntl new_entry = “foobar” with open(“/somepath/somefile.txt”, “a”) as g: fcntl.flock(g, fcntl.LOCK_EX) g.write(new_entry) fcntl.flock(g, fcntl.LOCK_UN) Note that on some systems, locking is not needed if you’re only writing small buffers, because appends on these systems are atomic.
The oneliner: open(“out1.txt”, “w”).writelines([l for l in open(“in.txt”).readlines() if “tests/file/myword” in l]) Recommended with with: with open(“in.txt”) as f: lines = f.readlines() lines = [l for l in lines if “ROW” in l] with open(“out.txt”, “w”) as f1: f1.writelines(lines) Using less memory: with open(“in.txt”) as f: with open(“out.txt”, “w”) as f1: for line in f: … Read more
I found a nice one liner here >> http://www.pixelchef.net/remove-empty-lines-file-powershell. Just tested it out with several blanks lines including newlines only as well as lines with just spaces, just tabs, and combinations. (gc file.txt) | ? {$_.trim() -ne “” } | set-content file.txt See the original for some notes about the code. Nice 🙂
There is no such thing as a EOF character. The operating system knows exactly how many bytes a file contains (this is stored alongside other metadata like permissions, creation date, and the name), and hence can tell programs that try to read the eleventh byte of a ten byte file: You’ve reached the end of … Read more
Simply try the below code and you may understand import React, { Component } from ‘react’; class App extends Component { constructor(props) { super(props); } showFile = async (e) => { e.preventDefault() const reader = new FileReader() reader.onload = async (e) => { const text = (e.target.result) console.log(text) alert(text) }; reader.readAsText(e.target.files[0]) } render = () … Read more