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empty terminal with multi lines

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user

I have problem with terminal .. I run a command but it took a time to be finish and it printed a lot of lines in terminal but when I came back to first line by mouse I got blank and empty screen .. How can I make terminal save the lines exist ?

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Viktor Nagy

There might be some bugs with your terminal emulator (gnome-terminal I assume), but if your goal is to read that data, you don't need to rely on terminal's scroll. You could always try a different terminal emulator, but all you need is to do something with that text.

  1. We can redirect that stream of data to a file (&> instead of > will capture even error output):

    my_command_with_long_output > /path/to/file

    Then read it with some text editor of choice.

  2. You can also redirect it directly to a pager like less:

    my_command_with_long_output | less

    and use less's scrolling (j/k, Ctrl+d/u).

The point is that the terminal emulator doesn't even need to be able to scroll for you to see long output.

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user
thanks a lot for replying but what if i want to see the first line during run ?
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Viktor Nagy
There are so many options how to answer this, but I would suggest trying `tee` command. You would use it like `my_command | tee /path/to/file` and it basically redirects output to said file **as well as outputs it to stdout for you to read instantly**. You could combine it with more tools, Maybe you wanted to store it as whole for you to read with editor, but only see first line during run: `my_command | tee /path/to/file | head -n 1`.
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