title: Shell Script to Validate Filename
body: <p>I have a requirement of creating a script to validate the filename. 
  There will be two files in the source from where Informatica job start picking up these files. One will be 'In progress File (Current day : Sysdate)' and the other will be Completed/ Closed File (previous day : i.e. with a file name aligned to Sysdate -1). Now ETL has to pick up all the files except In progress File ( File date is less than Sysdate). 
  Assuming current day is “22/06/2015” – the following is the list of files that ETL can expect to see in the source folder </p>
  
  <p>filename_22/06/2015_ready.csv – this file should be ignored 
  filename_21/06/2015_ready.csv – this file should be processed by ETL </p>
  
  <p>Please help me how I can write the shell script to fulfill this requirement. </p>