What does %s mean inside a string literal?

%s is a C format specifier for a string.

msg = g_strdup_printf (_("<b><big>Enter your password to run "
                         "the application '%s' as user %s"
                         "</big></b>"),
                         command, context->user);

means “where you see the first %s, replace it with the contents of command as a string, and where you see the second %s, replace it with the contents of context->user as a string.

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