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What does it mean in shell when we put a command inside dollar sign and parentheses: $(command)
...line of code in shell. It is used to get the current working directory. I am aware that $(variable) name return the value inside the variable name, but what is $(command) supposed to return? Does it return the value after executing the command? In that case, we can use ` to execute the command...
Difference between git checkout --track origin/branch and git checkout -b branch origin/branch
Does anybody know the difference between these two commands to switch and track a remote branch?
4 Answers
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What are “res” and “req” parameters in Express functions?
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req is an object containing information about the HTTP request that raised the event. In response to req, you use res to send back the desired HTTP response.
Those parameters can be named anything. You could change that code to this if it's more clear:
a...
Pandas every nth row
Dataframe.resample() works only with timeseries data. I cannot find a way of getting every nth row from non-timeseries data. What is the best method?
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notifyDataSetChange not working from custom adapter
When I repopulate my ListView , I call a specific method from my Adapter .
11 Answers
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常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...零散，于是汇总了一些常用的Git命令。
常用配置
system #系统级别
--global #用户全局
--local #单独一个项目
git config --global user.name "xxxx" #用户名
git config --global user.email "xxxx@xxx.com" #邮箱
git config --global core.editor vim #编辑器
gi...
Custom numeric format string to always display the sign
Is there any way I can specify a standard or custom numeric format string to always output the sign, be it +ve or -ve (although what it should do for zero, I'm not sure!)
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PostgreSQL naming conventions
Where can I find a detailed manual about PostgreSQL naming conventions? (table names vs. camel case, sequences, primary keys, constraints, indexes, etc...)
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How do I script a “yes” response for installing programs?
I work with Amazon Linux instances and I have a couple scripts to populate data and install all the programs I work with, but a couple of the programs ask:
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How do I setup a SSL certifim>cat m>e for an express.js server?
...as well as the Node docs for https.createServer (which is what express recommends to use):
var privateKey = fs.readFileSync( 'privatekey.pem' );
var certifim>cat m>e = fs.readFileSync( 'certifim>cat m>e.pem' );
https.createServer({
key: privateKey,
cert: certifim>cat m>e
}, app).listen(port);
Other opt...