cat file2 file 2 , what is the function of cat command here?
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opening file 1 and file 2
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concatenate file 1 and file 2 and print on standard output
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opening file 2 if file1 doesnt exist
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it will throw an error
The cat command concatenates multiple files and outputs to stdout. With 'cat file1 file2', it reads file1 followed by file2 and prints both contents sequentially to standard output. This is the primary use of cat - combining files for display or piping to other commands.
The cat command's core purpose is to concatenate the contents of one or more files and write the combined result to standard output (the terminal, by default). It doesn't just 'open' files or silently handle missing files — if a file argument doesn't exist, cat reports an error for that file while still processing the ones that do exist.