Need Help in reading N days files from a Directory & combining the files

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http://www.unix.com – Hi All, Request your expertise in tackling one requirement in my project,(i dont have much expertise in Shell Scripting). The requirement is as below, 1) We store the last run date of a process in a file. When the batch run the next time, it should read this file, get the last run date from the file. Using this date, the script should read all the files from the Directory that falls between Current Date & previous run date (the date we got from file) & combine it into one Single file for further processing. Any help/thoughts on how to accomplish this through Shell Script/multiple (HowTos)