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中文版 Location: Homepage >> Xianghui Xue : CV - Publications - Blog

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FAQ for ubuntu
See the following......
Link to this poster Source Code
Originated by Xianghui Xue at 2009-10-16 14:02 CST, Last modified at 2009-10-16 14:02 CST.

Contents

1 About Latex Contents Top

Q: texlive mssing lineno style package for latex

Answer from google
While working on a latex file that required the package lineno.sty, I realized that texlive distribution does not have it. I therefore, went for looking for the file and found it on CTAN. However, after installing it in the correct directory:
/usr/share/texmf-texlive/tex/latex/
the compiler would not find it, even when all the permissions were correct. In order for latex know that a new package has been installed, the command "sudo texhash" needs to be invoked in order for files in /var/lib/texmf be refreshed and reflect that a new package has been installed. Latex search these files instead of going through the actual directories, which results in a faster performance.

What I do
I just put the file into /usr/share/texmf-texlive/tex/latex/lineno/
and run sudo texhash. It's OK

Source Code

Originated by Xianghui Xue at 2009-10-16 14:02 CST, Last modified at 2009-10-16 14:02 CST.

2 SSH and Telnet Contents Top

1。Telnet bbs的时候出现乱码解决：luit -encoding gbk telnet bbs.ustc.edu.cn

2。SSH 连接远程主机长时间不操作无响应：
编辑~/.ssh/config 文件，加入 ServerAliveInterval 15

Source Code

Originated by Xianghui Xue at 2009-10-16 14:03 CST, Last modified at 2009-10-16 14:03 CST.

3 gnome花屏的处理 Contents Top

提示loaded theme的时候找不到相应的文件。

解决方法：
如果可以进入登录页面，那么登录后，运行sudo gdmsetup，重新选择一个theme。

如果出现花屏，进入recovery ubuntu，选择fix graph，然后登录，运行以上操作。

Source Code

Originated by Xianghui Xue at 2009-10-16 14:20 CST, Last modified at 2009-10-16 14:20 CST.

4 Vi & Vim Contents Top

1. 多行注释
在编写代码的时候经常要注释一大段代码,一行行的注释当然是最傻的方法了,在vim里面可以这样做, 移到要开始注释的那行,Ctrl+v进入可视化列选择模式,移到光标到最后需要注释的行(注意,如果你知道行号,可以使用行号G(大写的G)快速跳到该行),然后按I(大写),进入插入模式,输入注释符,比如fortran 90利用!,然后按ESC键回到命令模式。
反注释怎么办呢?更简单了,同样Ctrl+v进入列选择模式,移到光标把注释符选中,按下d。

2.多行复制
在要复制的位置shift+V，然后利用方向键选定要复制的区域后，按y，在要粘贴的位置按p。

Source Code

Originated by Xianghui Xue at 2009-10-16 14:21 CST, Last modified at 2009-10-16 14:21 CST.

5 Cisco VPN Client Contents Top

1. Installation：
Run vpnclient/vpn_install(version: vpnclient-linux-x86_64-4.8.01.0640-k9)
[root@]# ./vpn_install

For the linux kernel higher than 2.6.29, the VPN client for the linux won't compile with it. So the first thing is downloading a patch file (from http://projects.tuxx-home.at/ciscovpn/patches/vpnclient-linux-2.6.24-final.diff) and saving it in the vpnclient dir. Then you can use " patch < vpnclient-linux-2.6.24-final.diff" to patch the files. Thus ./vpn_install can install the VPN client successively.

And Then:
[root@]# /etc/init.d/vpnclient_init start
Edit /etc/opt/cisco-vpnclient/Profiles/sample.pcf to be (with your
own username)

[main]
Description=sample user profile
Host=192.43.244.230
AuthType=1
GroupName=hao
EnableISPConnect=0
ISPConnectType=0
ISPConnect=
ISPCommand=
Username=xhxue
SaveUserPassword=0
EnableBackup=0
BackupServer=
EnableNat=1
CertStore=0
CertName=
CertPath=
CertSubjectName=
CertSerialHash=00000000000000000000000000000000
DHGroup=2
ForceKeepAlives=0

Rename this file to, say ucar.pcf, then you can connect with
vpnclient connect ucar
First it asks for HAO password, then Cryptocard.
=================================================================
Problem:
有时返回一般连接时候，可能无法解析域名，此时修改/etc/resolv.conf文件即可。

2. Crash in multi-core cpus PC
So setup successively, but when try to connect VPN using wireless, it often crash the system.
Using google, it is caused by the multi-core CPUs, here is the tips: http://forum.tuxx-home.at/viewtopic.php?f=15&t=457&start=15.
The VPN client does not freeze the computer anymore if:
(1) I disable the multi-core option from the BIOS.
or
(2) I use the maxcpus=1 on the fly at the bootloader (Personally, I prefer this option...).
However, my question is: why the VPN client does not freeze my computer even with the BIOS multi-core option enabled or without the maxcpus=1 option? Only the wireless connection seems to be affected by this dual core issue...
===============================================

HOW TO?
To use (2), you must restart the laptop, and when grub loaded, press "e" and then choose " kernel /boot/vmlinuz-2.6.** root=/dev/hda2 ro quiet splash". Press "e" again and add maxcpus=1. Press "b" to boot the system.

-----
Then when you enter the system, check with
cat /proc/cpuinfo |grep physical | uniq -c
You can see
1 physical id : 0

Source Code

Originated by Xianghui Xue at 2009-10-16 14:24 CST, Last modified at 2009-12-09 05:34 CST.

6 crontab 实现系统自动执行命令 Contents Top

~# crontab -e

# m h dom mon dow command
具体意义表示：分钟小时日期月份星期命令，在某月（mon）的某天（dom）或者星期几（dow）的几点（h，24小时制）几分（m）执行某个命令（command），*表示任意时间。例如：

3 * * * * /home/xhxue/hello.sh

就是：每小时的03时执行/home/meng/下的hello.sh脚本。

在保存之后，根据屏幕下面的提示输入Ctrl+X退出，此时会提示是否保存，输入Y；提示输入文件名，并且有一个临时的文件名，由于只是测试，直接回车保存。

注意：在完成编辑以后，要重新启动cron进程：

~# /etc/init.d/cron restart

观察运行结果，会发现hello.sh会每隔一小时，在03分时被执行一次。

Source Code

Originated by Xianghui Xue at 2009-10-23 01:08 CST, Last modified at 2009-10-23 01:08 CST.

7 ubuntu是否有损硬盘？ Contents Top

利用命令 sudo smartctl -a /dev/sda |grep 193 可以查看硬盘的load_cycle_count信息，理论值位60万次左右。这个是我机器显示的结果：

193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always 582

15分钟后结果相同，也是582。前面看到有人说每5分钟这个数值就会增长5-10左右，而我的似乎没有这么严重，看来9以后的版本这个问题已经不重要了。

Source Code

Originated by Xianghui Xue at 2009-10-24 07:34 CST, Last modified at 2009-10-24 07:34 CST.

8 编码问题造成的linux和windows文件乱码解决 Contents Top

在linux下使用的是UTF8的编码，而windows使用的gbk，因此对于一些文本文档在linux和windows互相访问时，会出现乱码。解决的办法是：
如果windows的文件text.txt在linux下访问，可以通过:
iconv -f gbk -t utf8 text.txt > text.txt.linux
来实现正常的编码。

反之，如果linux文档在windows下访问，可以
iconv -f utf8 -t gbk text.txt > text.txt.windows
获得windows下的编码文件。在进行访问。

Source Code

Originated by Xianghui Xue at 2009-11-02 00:10 CST, Last modified at 2009-11-02 00:10 CST.

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