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How to represent multiple conditions in a shell if statement?
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Classic technique (escape metacharacters):
if [ \( "$g" -eq 1 -a "$c" = "123" \) -o \( "$g" -eq 2 -a "$c" = "456" \) ]
then echo abc
else echo efg
fi
I've enclosed the references to $g in double quotes; that's good practice, in general. Strictly, the parentheses aren't needed becau...
find without recursion
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I think you'll get what you want with the -maxdepth 1 option, based on your current command structure. If not, you can try looking at the man page for find.
Relevant entry (for convenience's sake):
-maxdepth levels
Descend at most levels (a non-negative integer) leve...
搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...台机器来做，如下图：
一台机器的一个数据表 Collection1 存储了 1T 数据，压力太大了！在分给4个机器后，每个机器都是256G，则分摊了集中在一台机器的压力。也许有人问一台机器硬盘加大一点不就可以了，为什么要分给四台...
Best way of returning a random boolean value
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edited Aug 23 '15 at 7:45
answered Nov 4 '11 at 16:43
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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...移动设备上的浏览器都会把自己默认的viewport设为980px或1024px（也可能是其它值，这个是由设备自己决定的），但带来的后果就是浏览器会出现横向滚动条，因为浏览器可视区域的宽度是比这个默认的viewport的宽度要小的。下图列...
Get last result in interactive Python shell
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Underscore.
>>> 5+5
10
>>> _
10
>>> _ + 5
15
>>> _
15
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Installing PG gem on OS X - failure to build native extension
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15 Answers
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Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...线安装docker&docker-composelinux_docker_install一、docker离线安装1、下载docker离线安装包下载最新版本的 docker （或者选择自己想要安装的版本）到本地。1）docker下载地址：Docker版本下载 ||Docker-compose版本下载备注...
一、docker离线安装
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Is there an opposite of include? for Ruby Arrays?
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How do I find the location of the executable in C? [duplicate]
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199
To summarize:
On Unixes with /proc really straight and realiable way is to:
readlink("/pro...