in reply to read files one by one in directory and redirct output to a file

I am not sure about what you want.
copy *.log result
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Re^2: read files one by one in directory and redirct output to a file
by afoken (Chancellor) on Jul 06, 2018 at 18:32 UTC
    copy *.log result

    That looks like Microsoft. On Unix-based systems, you would use this:

    cat *.log > result

    Alexander

    --
    Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
      On Windows, I believe the equivalent to your Unix command would be:
      type *.log > result
      On Unix, I think copy is cp. On either O/S it is possible to concatenate a bunch of binary files together into a single result file.
      copy (cp) works with binary files. type or cat is designed to work with text files.
        On Windows, I believe the equivalent to your Unix command would be:
        type *.log > result

        No, it is not. type treats Ctrl-Z (ASCII 26) as end-of-file marker. cat writes its entire input to STDOUT. cat can handle binary files, type can't.

        X:\>perl -E "say qq[Hello\cZWorld!]" > foo
        
        X:\>type foo
        Hello
        X:\>perl -pe 1 < foo
        Hello→World!
        
        X:\>
        

        Alexander

        --
        Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
        cat is the abbreviation for 'concatenate' and will do binary files just fine. cp will complain if it's instructed to copy multiple source files and the target is not a directory. Windows 'copy' is different from both.
        copy (cp) works with binary files. type or cat is designed to work with text files.

        Note that on *NIX/POSIX, there is generally no distinction between "binary" and "text" files. cp doesn't concatenate multiple files (-T, from your reply below, makes no difference here) - cat is "the" *NIX tool for concatenating files. If I guess that by "binary" vs. "text" you maybe mean "block-by-block" instead of "line-by-line", then that is course a valid point in regards to performance. But at least GNU Coreutils' cat is optimized to read and write files block-by-block, not line-by-line, when it doesn't need to do any line-by-line processing - see its simple_cat function.