Fix Backspace Key with GNU Screen on Arch Linux

it happens only in my x-windows terminal.

solution:

vi ~/.screenrc
--

bindkey -d ^? stuff ^H
bindkey -d ^@ stuff ^H


Some Error Messages Keep Appearing in Samba Log on Linux

printing/pcap.c:pcap_cache_reload(178)
Unable to open printcap file /etc/printcap for read!

printing/print_cups.c:cups_connect(103)
Unable to connect to CUPS server localhost:631 - Connection refused

solution:

load printers = no
printcap name = /dev/null
printing = bsd


lib/util_sock.c:get_peer_addr_internal(1676)
getpeername failed. Error was Transport endpoint is not connected

solution:

smb ports = 139


Set up Lighttpd, PHP, PhpMyAdmin, MySQL on Arch Linux

1. install packages

pacman -S lighttpd php phpmyadmin mysql

2. this script starts mysql daemon and also take care of the basic configuration as adding system users and creating log files

/etc/rc.d/mysqld start

3. force both mysql client and server to use utf8 encoding though not all kinds of clients read the setting

vi /etc/my.cnf
--

..
[client]
default-character-set = utf8
..
[mysqld]
default-character-set = utf8
..

4. it may be necessary to add a user and group for http. this user seems to need to have permissions to write to the /var/log/lighttpd

groupadd http
adduser http
chown -R http /var/log/lighttpd

5. lighttpd handles php through fastcgi so we have to enable it in /etc/lighttpd/lighttpd.conf

server.modules = (
..
"mod_fastcgi",
..
..
fastcgi.server = ( ".php" =>
( "localhost" =>
(
"socket" => "/var/run/lighttpd/php-fastcgi.socket",
"bin-path" => "/usr/bin/php-cgi"
)
)
)

6. for php and phpmyadmin, edit /etc/php/php.ini as follows

..
cgi.fix_pathinfo=1
..
extension=mysql.so
..

6. sample phpmyadmin configuration

vi /srv/http/phpMyAdmin/config.inc.php

--
<?php
/* Servers configuration */
$i = 0;

/* First server */
$i++;
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['extension'] = 'mysql';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['compress'] = false;
$cfg['Servers'][$i]['auth_type'] = 'http';
$cfg['Servers'][$i]['verbose'] = 'name_of_server';

/* End of servers configuration */

?>

7. start your web server

/etc/rc.d/lighttpd start

then enter the url, http://localhost/phpMyAdmin

Garbage Code in JAVA CJK Environment on Arch Linux

1. create /opt/java/jre/lib/fonts/fallback directory

2. make symbolic link for font

ln -s /usr/share/fonts/TTF/fontfile /opt/java/jre/lib/fonts/fallback/

if Wen Quan Yi, the full path is /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc

7-Zip Command Line

the linux version of 7zip is called p7zip
usage of 7za in windows is totally same to 7za in linux
the help message of command line version isn't detailed enough so here is an example

7za a -t7z -m0=lzma -mx=9 -mfb=64 -md=64m filename.7z target

a: add files to archive
e: extract files from archive (without using directory names)
-t: type of archive
-m0 : compression algorithm
-mx : compression level, 0 = no compression, 9 = ultra
-mfb : number of fast bytes for LZMA
-md : dictionary size
-ms=on : solid archive

p7zip is able to extract rar archives, but you have to use the exact command 7z, neither 7za nor 7zr because they are light-weighted commands which don't load plugins

if you use ubuntu, there is a package named p7zip-rar. on arch linux, p7zip package also installs rar plugin to /usr/lib/p7zip/Codecs/Rar29.so

7z e filenamr.rar


Cannot Copy Text in Vim While Using Putty

vim automatically sets visual mode when you click mouse buttons

solution is to stop vim from interpreting the mouse clicks

set mouse=


or add this to ~/.vimrc

Static ARP Entry and Wake on Lan on Arch Linux

1. install wol package in community repository

pacman -S wol

2. wol works only if the target machine is in the arp table. so if not, manually add an entry to the table

arp -s HOSTNAME MACADDRESS

hostname must be in /etc/hosts

3. to load permanent arp entry at boot time, create /etc/ethers then add the command into /etc/rc.local

vi /etc/ethers
--

MACADDRESS HOSTNAME


vi /etc/rc.local
--

arp -f

-f: if no filename is specified, /etc/ethers is used as default

4. wake up some machine

wol -h HOSTNAME MACADDRESS