随笔分类 -  Linux

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Regex - Greedy vs Lazy
摘要：We need to add a prefix "prefix-" to <MsgId><Id> element in xml messages but there might be a new line between <MsgId> and <Id>. Example of the xml me 阅读全文
posted @ 2018-04-03 23:25 小张的练习室 阅读(186) 评论(0) 推荐(0)
mtime vs ctime vs atime
摘要：mtime, atime and ctime are timestamps associated with the modification, access and change of any file respectively.mtimemtime (modification time) indi 阅读全文
posted @ 2018-03-27 00:25 小张的练习室 阅读(146) 评论(0) 推荐(0)
虚拟内存
摘要：Reference [1] http://blog.chinaunix.net/uid-26983585-id-3364091.html [2] http://www.cnblogs.com/yaoxiaowen/p/7805661.html [3] http://www.cnblogs.com/y 阅读全文
posted @ 2017-11-14 22:10 小张的练习室 阅读(284) 评论(0) 推荐(0)
Install Cassandra Locally
摘要：Uninstall Cassandra $ sudo su remove cassandra $ apt-get remove cassandra cleaned the cassandra folders $ rm -rf /var/lib/cassandra $ rm -rf /var/log/ 阅读全文
posted @ 2017-09-12 20:52 小张的练习室 阅读(155) 评论(0) 推荐(0)
Adjust Mouse Sensitivity Ubuntu
摘要：xinput --listxinput --set-prop 9 "Device Accel Constant Deceleration" 1.9xinput --set-prop 9 "Device Accel Velocity Scaling" 9 阅读全文
posted @ 2017-09-06 00:05 小张的练习室 阅读(215) 评论(0) 推荐(0)
Install Java 8 Ubuntu
摘要：sudo add-apt-repository ppa:webupd8team/javasudo apt-get -y update sudo apt-get -y install oracle-java8-installer sudo vim /etc/environment Add this a 阅读全文
posted @ 2017-09-05 23:26 小张的练习室 阅读(154) 评论(0) 推荐(0)
Linux Performance Monitoring Commands
摘要：Reference [1] http://www.thegeekstuff.com/2011/07/iostat-vmstat-mpstat-examples/?utm_source=feedburner [2] https://www.computerhope.com/unix/iostat.ht 阅读全文
posted @ 2017-06-26 18:24 小张的练习室 阅读(249) 评论(0) 推荐(0)
Linux server上too many open files问题
摘要：之前测试遇到了"too many open files"的问题。ulimit -Hn 查了下发现server上最大open file数是4096。写了个简单的脚本检测发现进程创建的fd个数在不断增加，8分钟之后达到上限然后程序报错，其中绝大部分fd都是关于socket的。 在server上安装lso 阅读全文
posted @ 2017-06-26 17:58 小张的练习室 阅读(208) 评论(0) 推荐(0)
Ubuntu热键控制spotify播放和音量调节
摘要：安装xbindkeys sudo apt-get install xbindkeys 新建配置文件 xbindkeys -d > ~/.xbindkeysrc 编辑热键 vim ~/.xbindkeysrc 添加以下命令 重启xbindkeys kill之前xbindkeys进程然后输入xbindk 阅读全文
posted @ 2017-05-11 16:52 小张的练习室 阅读(813) 评论(0) 推荐(0)
Ubuntu安装中文输入法
摘要：如果你没有因为各种尝试搞乱了Ubuntu系统的话： 1. 在All Settings 里找到 Language Support, Install/Remove Languages里安装Chinese (Simplified)。确保Keyboard input method system是IBus. 阅读全文
posted @ 2017-05-09 18:02 小张的练习室 阅读(181) 评论(0) 推荐(0)
CoreOS, Kubernetes, etcd
摘要：CoreOS CoreOS Container Linux is the leading container operating system, designed to be managed and run at massive scale, with minimal operational ove 阅读全文
posted @ 2017-05-04 04:34 小张的练习室 阅读(295) 评论(0) 推荐(0)
CPU Affinity
摘要：Reference: [1] http://www.linuxjournal.com/article/6799 Soft vs. Hard CPU Affinity There are two types of CPU affinity. The first, soft affinity, also 阅读全文
posted @ 2017-03-31 18:40 小张的练习室 阅读(242) 评论(0) 推荐(0)
Linux Set Command
摘要：1. set -e "Exit immediately if a simple command exits with a non-zero status." When this option is on, if a simple command fails for any of the reason 阅读全文
posted @ 2017-03-24 23:58 小张的练习室 阅读(448) 评论(0) 推荐(0)
Openstack & Ansible
摘要：Opennstack Open source software for creating private and public clouds Manages the servers at these sites so you can create Virtual Machines (VMs) for 阅读全文
posted @ 2017-03-20 04:30 小张的练习室 阅读(952) 评论(0) 推荐(0)
Linux Academy Learn Notes
摘要：Linux Essentials Certification Globbing ls ?.txt ? stands for one character while * means one or more characters ls [F]*.txt list file starting with F 阅读全文
posted @ 2017-02-23 17:48 小张的练习室 阅读(813) 评论(0) 推荐(0)
Unix Shortcuts
摘要：find . -name "*.java" -type f find all the files within a director and its sub-directory ended with .java rm *~ delete all the files ended with ~ grep 阅读全文
posted @ 2017-02-23 17:45 小张的练习室 阅读(223) 评论(0) 推荐(0)
Bash Excercises
摘要：1. cat <<EOF 2. let i++reference:[1] http://askubuntu.com/questions/385528/how-to-increment-a-variable-in-bash The same as: or even 3. getopts 阅读全文
posted @ 2016-12-21 18:10 小张的练习室 阅读(131) 评论(0) 推荐(0)
Bash Scripting Learn Notes
摘要：References: [1] http://www.tldp.org/LDP/Bash-Beginners-Guide/html/ 1. Executing programs from a script When the program being executed is a shell scri 阅读全文
posted @ 2016-09-26 19:11 小张的练习室 阅读(331) 评论(0) 推荐(0)
Linux parent process and child process when 'sudo'
摘要：如果在一般用户下如user，执行sudo命令，会产生两个进程。 ps -ef | grep Container root 4305 643 0 16:37 pts/39 00:00:00 sudo ./ContainerCompilation.shroot 4306 4305 0 16:37 pts 阅读全文
posted @ 2016-09-02 23:46 小张的练习室 阅读(336) 评论(0) 推荐(0)
Linux services, runlevels, and rc.d scripts
摘要：Reference: [1] https://www.linux.com/news/introduction-services-runlevels-and-rcd-scripts A Linux service is an application (or set of applications) t 阅读全文
posted @ 2016-09-02 17:09 小张的练习室 阅读(375) 评论(0) 推荐(0)

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