Shell Programming and Scripting

Value1
Value2
server1/mylogin,mypasswd
Value3
Value4

#! /bin/ksh
line_no=1;

while read line
do
  case $line_no in
  1) var1=$line;;
  2) var2=$line;;
  3) 
    logon_var=$line
    [I need to add my code here to update this line in the file
    [with masking text "SERVER/USERNAME,PASSWORD"]
  ;;
  4) var3=$line;;
  5) var4=$line;;
  esac

  line_no=`expr $line_no + 1`
done < input.file

echo $logon_var

Value1
Value2
SERVER/USERNAME,PASSWORD
Value3
Value4