Shell Programming and Scripting

I am trying to write a shell script which takes an input file as an arguement in the terminal e.g. bash shellscriptname.sh input.txt. I would like for the file to be read line by line each time checking if the .txt file contains certain words or letters(validating the syntax). If the line being read follows the syntax then it should be sent to another file called correct.txt if the syntax is incorrect of the line then it should be sent to incorrect.txt. I have been struggling to get the shell script to read the file and then assess the syntax. Please could someone help

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