Jim, Sales Andy, Sales Kelly, Customer Service Creed, Quality Assurance Michaes, Manager

stack overflow Questions Ruby IO

mode meaning

r read-only w write-only, truncates existing file to zero length or creates a new file for writing a write-only, starts at end of file if file exists, otherwise creates a new file for reading and writing

File.open("employees.txt", "a") do |file| file.write("\nOscar, Accounting") end

Jim, Sales Andy, Sales Kelly, Customer Service Creed, Quality Assurance Michaes, Manager Oscar, Accounting

File.open("employees.txt", "w") do |file| file.write("\nOscar, Accounting") end

Oscar, Accounting

File.open("index.html", "w") do |file| file.write("

Hello

") end

Hello World is created in index.html.

from stackoverflow r+ Read-write, starts at beginning of file.

File.open("index.html", "r+") do |file| file.readline() file.write("Hi") end

Jim, Sales Hidy, Sales Kelly, Customer Service Creed, Quality Assurance Michaes, Manager Oscar, Accounting

File.open("index.html", "r+") do |file| file.readchar() file.write("Hi") end

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