********************************************
* Description: Windows batch scripting tips
* Date: 05:59 PM EST, 09/06/2017
********************************************

		 
		 
<1> Turn on/off script execution process within the command line:
     |
     |__ CMD> @echo off
     |
     |__ CMD> @echo on
	 

	 
	 
<2> Comment comparison of "::" and "REM":
     |
     |__ REM: all the commented content will show up during script execution.
     |
     |__ "::": the commented content will not show up when script got executed from command line.
	 
	 

	 
<3> Print a blank line on command line:
     |
     |__ Sometimes, command line output should be friendly readable by seperated by blank line.
     |
     |__ CMD> echo.
     |
     |__ CMD> echo[
     |
     |__ CMD> echo(	 
	 
	 
	
	
<4> Hidden the errors thrown out by command:
     |
     |__ CMD> forfiles /P %LOG_LOCATION% /M Critical_Log_PS_* /D -1 /C "cmd /c Del @FILE"	 
     |
     |           CAUTION: when above command can not find the target files to delete, error will show up "System could not find sepacific files to delete".
     |
     |__ CMD> forfiles /P %LOG_LOCATION% /M Critical_Log_PS_* /D -1 /C "cmd /c Del @FILE" > nul 2> nul
	 
	 
	
	
<5> Condition "if" can not includes multiple commands, calling a seperated functin as work aroudn:
     |
     |__ CMD> if %var_count% LSS %~2 
     |        (
     |            echo %filedatetime% > %LOG_LOCATION%\Critical_Email_PS_Status_%~1.txt
     |            echo.>> %LOG_LOCATION%\Critical_Email_PS_Status_%~1.txt
     |            echo Critical Alert for Process Scheduler - %~1 in critical state >> %LOG_LOCATION%\Critical_Email_PS_Status_%~1.txt
     |            %email_client% %LOG_LOCATION%\Critical_Email_PS_Status_%~1.txt -to %criticalEmail% -subject "CRITICAL:%server%:ManTech - %~1 Process Scheduler in Critical State"
     |         )
     | 
     |
     |__ CMD> if %var_process_count% LSS %~2 ( call :func_email_log %var_process_schedule_name% %var_process_count% )	 
	 
	 
	 

<6> When sending email via msmtp, there should be a blank line between address section and main body section. CAUTION: no space in between "echo" and ">>":
     |
     |__ CMD> echo to: support@emeralit.com > email.txt
              echo from: sqlmail@emeralit.com >> email.txt
              echo subject: Test Email >> email.txt
              echo.>> email.txt
              type email_body.txt >> email.txt	 
              msmtp -t < email.txt
		

		
		
<7> Sometimes, script functions normally on command line, but failed on task scheduler. One of the reasons is that the referred external script is not indicated with full path:
     |
     |__ CMD> for /f "delims=" %%a in ('sqlplus -s / as sysdba @file_archivelog_sequence.sql') do @set var_sequence=%%a
     |
     |__ CMD> for /f "delims=" %%a in ('sqlplus -s / as sysdba @%var_script_location%\file_archivelog_sequence.sql') do @set var_sequence=%%a
		
	


<7> In Windows OS, if the full path containing space, then doule quote are needed when issue from batch script:
     |
     |__ CMD> C:\"Program Files"\7-Zip\7z.exe a -m0=lzma2 -mmt6 -t7z -mx=9 -p%var_7zip_password% %var_dump_directory%\expdp.dmp.7z %var_dump_directory%\expdp.dmp