Jean - 记录成长历程 » Linux系统

Linux时间戳转换

admin — Mon, 28 Feb 2011 11:05:01 +0000

获取N天后的时间

date -d “32 days” +%s

获取N天前的时间

date -d “32 days ago” +%s

将时间戳转换成人眼可识别的形式

date -d ’1970-01-01 UTC 1123495443 seconds’

在Ruby下将时间戳转换

Time.at(1123495443).strftime(“%Y-%m-%d”)

输出格式可以自定义 http://www.ruby-doc.org/core/classes/Time.html#M000392

服务器监控又一选择Munin

admin — Sat, 15 Jan 2011 12:51:43 +0000

偶然看到一个主机商家在使用它作服务器状态监控，并对外实时公布。于是留心看了下网上的评论，有用户反应比cacti配置方便，如果没有特殊需要，替代cacti未尝不可。

Munin is a networked resource monitoring tool that can help analyze resource trends and “what just happened to kill our performance?” problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.

http://munin-monitoring.org/

在Mac上手动更新locate数据

admin — Sat, 08 Jan 2011 11:52:58 +0000

Here’s one of those little things I do frequently, but never remember the command. The ‘locate’ command searches a file name database that is updated weekly (I think the default update time is 4:30 am every Saturday morning, but only if your Mac is switched on then, which mine never is). If you try to run ‘locate’ on a database that isn’t current, files created more recently than the last update will not be found, and deleted files will be found erroneously. To update the database manually use the following command:

sudo /usr/libexec/locate.updatedb

用Wget抓目录

admin — Tue, 12 Oct 2010 14:51:02 +0000

实例:

wget -nd -r -l1 –no-parent http://media.pragprog.com/titles/rails3/code/depot_c/public/images/

tokyocabinet-1.4.45安装时报错bzlib.h is required

admin — Thu, 02 Sep 2010 12:45:39 +0000

安装tokyocabinet-1.4.45时./configure会出现如下错误:

configure: error: bzlib.h is required

[root@jeantoe tokyocabinet-1.4.45]# yum install bzip2-devel

LFTP增量更新

admin — Tue, 10 Aug 2010 06:43:32 +0000

mirror -R --only-newer --only-missing /dirname

lftp登陆时不会泄漏密码

admin — Fri, 02 Jul 2010 10:39:03 +0000

tcpdump分析了FTP和LFTP方式登录服务器数据包，发现使用lftp登陆时的request是AUTH/TLS，对这个协议不是太了解，反正传输过程中看不到明文的用户名和密码。

用FTP直接连接的时候用户名和密码能够直接被捕获到，服务器那边直接就request USER和PASSWORD。

curl: (3) [globbing] illegal character in range specification at pos

admin — Tue, 29 Jun 2010 04:27:31 +0000

问题：

[jean@jeantoe /]$ curl ‘http://www.baidu.net/?username[]=cui&delradacct=yes&submit=Apply’curl: (3) [globbing] illegal character in range specification at pos 32

解决：

[jean@jeantoe /]$ curl ‘http://www.baidu.net/?username\[\]=cui&delradacct=yes&submit=Apply’

Apache SSL配置

admin — Mon, 21 Jun 2010 12:53:42 +0000

ServerName www.zhangyiqun.net
ServerAlias zhang.net
DocumentRoot /xxx

ErrorLog /xxx

# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
#SSL
SSLEngine on
SSLCACertificateFile /etc/apache2/ca.txt
SSLCertificateFile /etc/ssl/crt/www.vpn38.net.crt
SSLCertificateKeyFile /etc/ssl/crt/private.key

需要开启ssl模块，否则会出现ssl command not found之类的错误

Vim乱码问题解决

admin — Wed, 09 Jun 2010 04:11:36 +0000

vim .vimrc

set encoding=utf8

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