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Sending emails securely
ByQ ASending emails securely is needed for certain situations, such as sending my bank account to my wife, giving my account password to my close friend for a while. How to send it? Regarding the recent US PRISM program, it is an important issue. Seeing your solution, a few of my own popped up. Here are…
How to disable SSH reverse DNS lookup on Linux?
ByEric MaHow to disable the reverse DNS lookup by the SSD server on Linux? To turn off reverse DNS lookups of the SSH daemon, log on the server and add UseDNS no to /etc/ssh/sshd_config. And remember to restart the sshd service by service sshd restart or systemctl restart sshd.service or other commands depending on your system….
How to print all fields after a certain field with awk on Linux?
ByEric MaHow to print all fields after a certain field with awk on Linux? Say, I want to print out all fields after field $3: a b c d e f a b b b a a c d should be transformed to d e f b d You may use a for loop in awk…
PUMA: A MapReduce Benchmark Suite
ByEric MaMapReduce is a well-known programming model designed for generating and processing large data. There are various MapReduce implementations. One widely known and used one may be Hadoop. Benchmarking MapReduce frameworks gets to be important. Faraz Ahmad et al. developed a benchmark suite: PUMA MapReduce Benchmark. During our work on MapReduce, we developed a benchmark suite…
Several Vim Tips (in Chinese)
ByEric Ma窗口模式操作 CTRL-W CTRL-S 将当前窗口分割为两窗口 CTRL-W CTRL-W 切换窗口 CTRL-W j 切换到下一窗口 CTRL-W k 切换到上一窗口 CTRL-W CTRL-R 将窗口的位置轮换 CTRL-W CTRL-_ 将当前窗口最小化 CTRL-W CTRL-= 将所有窗口变为等大 搜索和替换 /word 搜索word 搜索之后按回车高亮显示,n 下一个 p 上一个 :%s/模式/替换成的内容/gc % 全局选项,如果没有开启则只在当前行进行替换 g 表示 全局替换,如果没有g选项则只替换每行出现的第一个单词 c 表示需要确认 Esc替换按键 ESC键在键盘的左上角,按起来很不方便,而在VIM中ESC经常用到,其实有一个同样作用的组合按键:CTRL-[,这两个按起来手基本不用做大的动作,方便多了。 块操作 使用visual可视模式 v 进入可视模式,移动光标可进行选择 CTRL-Q 或 CTRL-V 进入列式模式,可进行块操作,选定的是一个矩形块。如果使用behave mswin CTRL-V可能映射成为past Read more: How to convert between…
How to split a gzip file to several small ones on Linux?
ByEric MaI have a very large (e.g. 100GB) .gz file and would like to split it into smaller files like 8GB/each for storage/copying. How to split a gzip file to several small ones on Linux? You may use the tool split to split a file by sizes. An example to split a large.tgz to at most…
