ruby - Is there a way to delete a line in a text file if it matches a specific text? -

my text file contains email/password list set accounts. once i've used email , password combo erase form text file.

my text file looks this:

email,pass email,pass etc.. 

once i've used e/p combo delete file:

file.open("yahoo_accounts.txt") |email|   email.each |item|     email, password = item.chomp.split(',')     emails << email      passwords << password     emails.zip(passwords) { |name, pass|          browser = watir::browser.new :ff          #using email , pass          file.open("yahoo_accounts.txt", "w") |out_file|             file.foreach("yahoo_accounts.txt","r") |line|                 out_file.puts line unless line == '#{name},#{pass}'             end         end         browser.close     end end 

the problem occurs when try delete them file. "browser.rb:382:in `assert_exists': browser closed (watir::exception::error)", might browser closing.

if e/p's extracted (meaning there nothing delete) in beginning, how can loop keep going, instead of ending in error after first zip loop?

if file not huge, can read array, modify array , write array file, overwriting previous contents.

code

def remove_lines(fname, user_name, password)   io.write(fname, io.read(fname).gsub(/^#{user_name},#{password}\n/, '')) end 

example

let's create data:

text =<<_ bubba,boar henrietta,vespa luigi,pink bubba,boar luigi,mauve _   #=> "bubba,boar\nhenrietta,vespa\nluigi,pink\nbubba,boar\nluigi,mauve\n" 

and write file:

fname = "tmp" io.write(fname, text)   #=> 61 

we can confirm we've written file:

io.read(fname)   #=>  "bubba,boar\nhenrietta,vespa\nluigi,pink\nbubba,boar\nluigi,mauve\n" 

now remove lines user_name/password #=> bubba/boar:

remove_lines(fname, "bubba", "boar")   #=> 39 

let's confirm worked examining fname:

io.read(fname)   #=> "henrietta,vespa\nluigi,pink\nluigi,mauve\n" 

postscript

if goes wrong while writing array file, may lose both old file , new file. reason, practice write array temporary file, delete original file, rename temporary file name of original file.