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From: Aleksey Midenkov <midenok@gmail.com>
Date: Thu, 26 Mar 2015 16:28:00 -0000
Message-ID: <CAF8BazAOQC-otNoogUc92mnjoxJwt8R166tx0=7JX04qFks_+g@mail.gmail.com>
Subject: How to compare $arg0 with string literal?
To: "gdb@sourceware.org" <gdb@sourceware.org>
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X-SW-Source: 2015-03/txt/msg00101.txt.bz2

F.ex.

define logging
    if $argc == 1
        if $arg0 == off
            set logging off
            set logging file gdb.log
        else if $arg0 == stop
            set logging off
        else
            set logging $arg0
        end
    else
        set logging $arg0 $arg1
    end
    show logging
end

When type 'logging off' I get error about no such symbol 'off'...