[SOLVED] trying to understand /etc/rc.d/rcS.d/S70console

lup_378 · 09-15-2015, 10:58 AM

I have an error during but:
/etc/rc.d/rcS.d/S70console returns 1

And now i am trying to understand the rison. I need /etc/sysconfig/console file because of i need Russian locale, UTF-8 encoding and language switching in console.
So i have started to read /etc/rc.d/rcS.d/S70console and there are some things that i do not understand:

Code:

# Figure out the command to set the console into the
# desired mode
  is_true "${UNICODE}" &&
    MODE_COMMAND="echo -en '\033G' && kbd_mode -u" ||
    MODE_COMMAND="echo -en '\033@\033(K' && kbd_mode -a"

I have foud that:
"\033G" - is to put console into UTF-8 mode;
"\033(K" - is to enable font switching. Am i right?
But i have not found what "\033@" means.
Could You please help me with this?

Luridis · 09-15-2015, 04:33 PM

I had to look this up myself. It looks like the character that immediately follows the ANSI terminal escape "\033" is part of the "Control Sequence Introducer" or CSI. In my terminal, it doesn't appear to do anything at all if I...

Quote:

echo -e '\033@'
or
echo -e '\033@hudhifuhdf\033@uhdkhfkjd'

Nothing changes before or after the \033@ when I run the latter.

I did find these three documents that mention this sequence. Two say that it is a NULL or a filler and is ignored by the terminal. The last says that it is "a reserved code intended for use as padding in future specifications" but was never standardized. It also says that it's listed as "xxx" in Unicode, which I'll gather means it is unused.

My guess: could be a typo or something dangling from a copy-paste. It could also be some xterm related setting I didn't manage to find. Try taking it out and see what happens.

EDIT: Sorry, one of the links broke. Some foolish web developer over at Attachmate still thinks session-specific URLs is a good idea and I'm not going to take the time to try to sort out his blunder.

rtmistler · 09-16-2015, 07:13 AM

Octal 033 is ESCAPE http://web.cs.mun.ca/~michael/c/ascii-table.html, that is what the backslash-033 designates.

There are various termininal emulations as well as local settings which may be over-ridden from a standard profile.

And sometimes a universal attribute setting is not supported by all terminals.

I do not know what the \033@ represents either, however it may not be doing anything at all in spite of the intention of that setting, the terminal may be ignoring it.

Try taking it out from your script and seeing what, if any, properties no longer get set up.

lup_378 · 09-24-2015, 06:32 AM

Sorry for delayed responce.
In my console "echo '\033@'" does something like printf("\n"); and nothing more.
In result i do not understand what is means, but i have found misprint in "/etc/sysconfig/console" in KEYMAP variable. I have fixed it and now "S70console" script works fine

It was:
KEYMAP="/usr/share/keymaps/i386/qwerty/ruwin_ctrl_sh-UTF-8.map.gz"
fixed to:
KEYMAP="/usr/share/keymaps/i386/qwerty/ruwin_ct_sh-UTF-8.map.gz"
Thank you!