There is some output in console when I'm doing
svn update
How can I get this output later, when console is closed?
Whatever "console" means in your case, once you've closed the window where svn update printed its output the output is gone. If operating systems would routinely store all output of command line programs, you'd soon run out of memory or disk space.
As in all console applications, you can simply redirect output to an external file with the > redirection operator:
svn update > /path/to/file.log
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