-------------------------------------------------------------------------------
With the default US keymap, you can use Shift with the PageUp and
PageDown keys. (The gray ones, not the ones on the numeric keypad.)
With other keymaps, look in /usr/lib/keytables. You can
remap the ScrollUp and ScrollDown keys to be whatever you like. For
example, to remap them to the keys on an 84-key, AT keyboard.
The "screen" program, http://vector.co.jp/vpack/browse/person/an010455.html provides a searchable scrollback buffer and the ability to take ``snapshots'' of text-mode screens.
You can't increase the amount of scrollback, because it is implemented
using the video memory to store the scrollback text. You may be
able to get more scrollback in each virtual console by reducing the
total number of VC's. See linux/tty.h.
-------------------------------------------------------------------------------
In text mode, press Left Alt-F1 to Alt-F12 to select the consoles
tty1 to tty12; Right Alt-F1 gives tty13 and
so on. To switch out of X Windows you must press Ctrl-Alt-F1, etc;
Alt-F5 or whatever will switch back.
If you want to use a VC for ordinary login, it must be listed in
/etc/inittab, which controls which terminals and virtual
consoles have login prompts. The X Window System needs at least one
free VC in order to start.
-------------------------------------------------------------------------------
Change directory to /usr/lib/zoneinfo/. Get the time zone
package if you don't have this directory. The source is available as
sunsite.unc.edu/pub/Linux/system/admin/time/timesrc-1.2.tar.gz.
Then make a symbolic link named localtime pointing to one of
the files in this directory (or a subdirectory), and one called
posixrules pointing to localtime. For example:
ln -sf US/Mountain localtime ln -sf localtime posixrulesThis change will take effect immediately--try
date(1).
The manual page for tzset describes setting the time zone. Some programs recognize the TZ environment variable, but this is not POSIX-correct.
You should also make sure that your Linux kernel clock is set to the
correct GMT time--type date -u and check that the
correct UTC time is displayed. (``
My clock is very wrong.
'')
-------------------------------------------------------------------------------
Type:
uname -a
-------------------------------------------------------------------------------
By using the ulimit command in bash, the
limit
command in tcsh, or the rlimit command in
ksh. See the appropriate manual page for details.
This setting affects all programs run from the shell (directly or indirectly), not the whole system.
If you wish to enable or disable core dumping for all processes by
default, you can change the default setting in
linux/sched.h--see the definition of
INIT_TASK, and look also in linux/resource.h.
-------------------------------------------------------------------------------
See the Kernel HOWTO or the README files which come with the kernel
release on ftp.cs.helsinki.fi, in /pub/Software/Linux/Kernel/
and mirrors. (See ``
Where can I get Linux material by FTP?
'') You may already have a version of the kernel source code
installed on your system, but if it is part of a standard distribution
it is likely to be somewhat out of date (this is not a problem if you
only want a custom configured kernel, but it probably is if you need
to upgrade.)
With newer kernels you can (and should) make all of the following targets. Don't forget that you can specify multiple targets with one command.
make clean dep install modules modules_install
Also remember to update the module dependencies.
depmod -a
Remember that to make the new kernel boot you must run LILO after copying the kernel into your root partition--the Makefile in recent kernels has a special zlilo target for this; try:
make zliloKernel version numbers with an odd minor version (ie, 1.1.x, 1.3.x) are the testing releases; stable production kernels have even minor versions (1.0.x, 1.2.x). If you want to try the testing kernels you should probably subscribe to the linux-kernel mailing list. (See `` What mailing lists are there? .'')
-------------------------------------------------------------------------------
Yes, but you won't be able to use simultaneously two ordinary ports which share an interrupt (without some trickery). This is a limitation of the ISA Bus architecture.
See the Serial HOWTO for information about possible solutions and workarounds for this problem.
-------------------------------------------------------------------------------
Make a file system on it with bin, etc, lib and dev directories--everything you need. Install a kernel on it and arrange to have LILO boot it from the floppy (see the LILO documentation, in lilo.u.*.ps).
If you build the kernel (or tell LILO to tell the kernel) to have a RAM disk the same size as the floppy the RAM disk will be loaded at boot time and mounted as root in place of the floppy.
See the Bootdisk HOWTO.
-------------------------------------------------------------------------------
For recent kernels, get /pub/Linux/system/Keyboards/kbd-0.90.tar.gz from sunsite.unc.edu. Make sure you get the appropriate version; you have to use the right keyboard mapping package for your kernel version.
For older kernels you have to edit the top-level kernel Makefile, in /usr/src/linux.
You may find more helpful information in The Linux Keyboard and Console HOWTO, by Andries Brouwer, at sunsite.unc.edu/pub/Linux/docs/HOWTO.
-------------------------------------------------------------------------------
Use the setleds program, for example (in /etc/rc.local or one of the /etc/rc.d/* files):
for t in 1 2 3 4 5 6 7 8
do
setleds +num < /dev/tty$t > /dev/null
done
Setleds is part of the kbd package (``
How do I remap my keyboard to UK, French, etc.?
'').
Alternatively, patch your kernel. You need to arrange for KBD_DEFLEDS to be defined to (1 << VC_NUMLOCK) when compiling drivers/char/keyboard.c.
-------------------------------------------------------------------------------
The following shell script should work for VGA consoles:
for n in 1 2 4 5 6 7 8; do
setterm -fore yellow -bold on -back blue -store > /dev/tty$n
done
Substitute your favorite colors, and use /dev/ttyS$n for serial
terminals.
To make sure they are reset when people log out (if they've been changed):
Replace the references to ``getty'' (or ``mingetty'' or ``uugetty'' or
whatever) in /etc/inittab with references to
``/sbin/mygetty.''
#!/bin/sh setterm -fore yellow -bold on -back blue -store > $1 exec /sbin/mingetty $@
[Jim Dennis] -------------------------------------------------------------------------------
Use several swap partitions or swap files--Linux supports up to 16 swap areas, each of up to 128Mb.
Very old kernels only supported swap partition sizes up to 16Mb.
Linux on machines with 8KB paging, like Alpha and Sparc64, support a swap partition up to 512KB. The 128KB limitation comes from PAGE_SIZE*BITSPERBYTE on machines with 4KB paging, but is 512KB on machines with 8KB paging. The limit is due to the use of a single page allocation map.
The file mm/swapfile.c has all of the gory details.
[Peter Moulder, Gordon Weast]
===============================================================================