Can you help me please

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http://www.unix.com – Hi, am a student and i have homework about bourne shell script and i am having difficulties because i've never written this kind of scripts. So i have to write a script that check if files header.txt, content.txt and footer.txt exist. If they exist i have to read every one of them and use the lines without "#" and to generate HTML file with this data ( the data from header.txt shoud be copied between header tags, content.txt between body tags and footer.txt between footer.tags. Atleast i am understanding it like that) After that i have to check if the HTML file modify date is ol (HowTos)