UNIX for Dummies Questions & Answers

=== 2014-02-09 15:46:59,936 [c-22] INFO  RequestContext - URL: '/eyisp/sc/skins/EY/images/pickers/comboBoxPicker_Over.png', User-Agent: 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko': Unsupported with Accept-Encoding header
=== 2015-02-09 15:46:59,937 [c-22] INFO  Download - done streaming: /usr/share/apache-tomcat-8.0.12/webapps/ROOT/eyisp/sc/skins/EY/images/pickers/comboBoxPicker_Over.png
Server Console List of Data :- 5
=== 2015-02-09 15:47:08,792 [c-27] INFO  Download - Returning 304: Not modified on conditional get of: /usr/share/apache-tomcat-8.0.12/webapps/ROOT/eyisp/sc/skins/EY/images/Progressbar/progressbar_h_empty_stretch.gif
=== 2015-02-10 05:47:08,793 [c-14] INFO  Download - Returning 304: Not modified on conditional get of: /usr/share/apache-tomcat-8.0.12/webapps/ROOT/eyisp/sc/skins/EY/images/Progressbar/progressbar_h_empty_end.gif
=== 2015-02-10 05:47:08,793

#!/bin/bash
        search="Download"
        logfile=/home/kudos/hari/logfn.txt
        str_output=""
        start_year=2014
        start_month=02
        start_day=9
        end_year=2015
        end_month=03
        end_day=10
                while [ $start_year -lt $end_year ];do
                while [ $start_month -lt $end_month ];do
                while [ $start_day -lt $end_day ];do
                        str_output+="$(grep $start_year-$start_month-$start_day $logfile|grep $search && printf '\n' )"
                        ((start_day++))
                        [ $start_day -gt 31 ] && start_day=1 && ((start_month++))
                                done
                                ((start_month++))
                        [ $start_month -gt 12 ] && start_month=1 && ((start_year++))
                                done
                                ((start_year++))
                        [ $start_year -gt $(date +'%Y') ] && break
                                done
         printf "${str_output}\n"

[root@test hari]# ./SCRIPT.sh
[root@test hari]#

str="Hello"
$ str+=" "
$ str+="World"
$ echo $str
Hello World
$

$ str="Hello"
$ str+=" "
bash: str+= : command not found
$ str+="World"
bash: str+=World: command not found
$

$ str="Hello"
$ str="$str "
$ str="${str}World"
$ echo "$str"
Hello World
$