help(read.table)
/////////////////////////////////
read.table(file, header = FALSE, sep = "", quote = "\"'",
           dec = ".", numerals = c("allow.loss", "warn.loss", "no.loss"),
           row.names, col.names, as.is = !stringsAsFactors,
           na.strings = "NA", colClasses = NA, nrows = -1,
           skip = 0, check.names = TRUE, fill = !blank.lines.skip,
           strip.white = FALSE, blank.lines.skip = TRUE,
           comment.char = "#",
           allowEscapes = FALSE, flush = FALSE,
           stringsAsFactors = default.stringsAsFactors(),
           fileEncoding = "", encoding = "unknown", text, skipNul = FALSE)
/////////////////////////////////

Youtubes 
/////////////////////////////////
 MarinStatsLectures- R Programming & Statistics,2013, Import Data, Copy Data from Excel to R CSV 
    & TXT Files | R Tutorial 1.5 | MarinStatsLectures
   (617k,s67k,t6:58)
   https://www.youtube.com/watch?v=qPk0YEKhqB8

 MrClean1796,2015,R Studio: Importing & Analyzing Data
   (v212k,s20k,t7:21)
   https://www.youtube.com/watch?v=Uo1C7Iligw0

 Tuke,Jonathan, 2012, Entering data into R
   (v26k,s366k,t9:47)
   https://www.youtube.com/watch?v=dBZ_vBqkSug

/////////////////////////////////

Closing a link: unlink() function 
/////////////////////////////////

path<-"http://datayyy.com/data_csv/ibmMonthly.csv"
con<-url(path)
x<-read.csv(con)

unlink(con)

/////////////////////////////////

.showingFormula function  needs R package called 'png'
  Please install it by issuing 
  install.packages('png')

download.file() function 
/////////////////////////////////
Example #1:
  
 download.file("http://datayyy.com/data_csv/ibmMonthly.csv","c:/temp/ibmMonthly.csv",quiet = TRUE,mode='wb')
  
Example #2: 
   inFile<-'https://www.sec.gov/Archives/edgar/full-index/1999/QTR1/company.idx'
   outFile= 'c:/temp/secindex1999q1.txt'
   download.file(inFile, outFile,quiet = TRUE,mode='wb')

/////////////////////////////////

Manually download data from Yahoo!Finance 
///////////////////////////////
 Step 1: go to https://finance.yahoo.com

 Step 2: enter a ticker such as ibm

 Step 3: Click 'historical data' 

 Step 4: from period to choose MAX
         then click Done

 Step 5: Choose monthly 
         click Apply 

 Step 6: Click Download Data 

> infile<-'http://datayyy.com/data_csv/ibmMonthly.csv'
> .is404(infile)
[1] 200
/////////////////////////////////