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Reading and writing to a txt file in Free Pascal

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Last Modified: 2018-07-30
I am going to be doing some simple text processing with Free Pascal.  I will have to read in a text file, chop the text up a bit, and then write to a new file.  I looked for a sample program online and it talked about a dat file.  I don't remember how this relates to a txt file.  My input file is a txt file.

Years ago I was working in a unix environment, and I vaguely remember doing things with < or > to tell the operating system what input file to use and what output file to use.  How do you tell Free Pascal what your input and output files are?
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