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Add new field to every document in a MongoDB collection
...gt; db.foo.insert({"test":"a"})
> db.foo.find()
{ "_id" : ObjectId("4e93037bbf6f1dd3a0a9541a"), "test" : "a" }
> item = db.foo.findOne()
{ "_id" : ObjectId("4e93037bbf6f1dd3a0a9541a"), "test" : "a" }
> db.foo.update({"_id" :ObjectId("4e93037bbf6f1dd3a0a9541a") },{$set : {"new_field":1}})
&g...
Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
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Susam PalSusam Pal
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Why is argc not a constant?
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The C standard (ISO/IEC 9899:2011) says:
5.1.2.2.1 Program startup
¶1 The function called at program startup is named main. The implementation declares no
prototype for this function. It shall be defined with a return type of int and with no
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Remove unwanted parts from strings in a column
... column?
– medev21
Sep 1 '16 at 19:50
Can I use this function to replace a number such as the number 12? If I do x.ls...
How to retrieve the current version of a MySQL database management system (DBMS)?
...-+------------------------------------------+
| protocol_version | 10 |
| version | 5.0.27-standard |
| version_comment | MySQL Community Edition - Standard (GPL) |
| version_compile_machine | i686 ...
How to convert latitude or longitude to meters?
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180
Here is a javascript function:
function measure(lat1, lon1, lat2, lon2){ // generally used geo...
How do you access command line arguments in Swift?
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edited Jun 20 at 9:12
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answered Feb 27 at 23:34
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demystify Flask app.secret_key
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106
Anything that requires encryption (for safe-keeping against tampering by attackers) requires th...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...本兼容性
网络扫描限制
网络建议API（Android >= 10）
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TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展
在无线局域网中使用的功...
Generate GUID in MySQL for existing Data?
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