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I have a massive of words...like @massive and a simple $word scalar...how to check if there's a word in that massive which equals @word?

For example I need to send an email from my PC to another email I use perl with sendmail module. I use public email server to send my emails. Should I make a local server? I just need to edit some MIME headers before sending: there're 4 headers "Recieved:" how could I change them??? oh...

I have a work bookI don't know how many worksheets in the, but I have to write in every worksheet in a workbook some text (for example "hello world") in cell A1. I don't know worksheets number but I have to put some text in every worksheet.

I have a simple exel worksheet, there're 2 rows not empty for example 2 first rows have some text in column A. How could I find an empty row (eg 3rd) and put there something.

I have a file, there're some numbers separated with "," example: 1, 5, 6, 8, 10. I have an integer it's equals 8 (int = 8). How to check if the int equals at least any number in that file? P.S. Sorry about my english

I have a file, there're some numbers separated with "," example: 1, 5, 6, 8, 10. I have an integer it's equals 8 (int = 8). How to check if the int equals at least any number in that file? P.S. Sorry about my english