大约有 32,000 项符合查询结果（耗时：0.0407秒） [XML]
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
Update: Now that it's 2016 I'd use PowerShell for this unless there's a really compelling backwards-compatible reason for it, particularly because of the regional settings issue with using date . See @npocmaka's https://stackoverflow.com/a/19799236/8479
...
How to Deep clone in javascript
...
It really depends what you would like to clone. Is this a truly JSON object or just any object in JavaScript? If you would like to do any clone, it might get you into some trouble. Which trouble? I will explain it below, but first...
Use of “global” keyword in Python
...l variables is seldom considered a good solution.
def bob():
me = "locally defined" # Defined only in local context
print(me)
bob()
print(me) # Asking for a global variable
The above will give you:
locally defined
Traceback (most recent call last):
File "file.py", line 9, in &l...
How to check if a python module exists without importing it
...ING
When trying to find a submodule, it will import the parent module (for all of the above methods)!
food/
|- __init__.py
|- eggs.py
## __init__.py
print("module food loaded")
## eggs.py
print("module eggs")
were you then to run
>>> import importlib
>>> spam_spec = importli...
Why is the Windows cmd.exe limited to 80 characters wide?
...(even in the days of 128mb machines and the one time you need it, you'll REALLY be glad you set it before hand. The width is a personal preference, I don't like seeing line wraps from my compiler except under extreme conditions, but others don't ever like to scroll.
– Bill K
...
The shortest possible output from git log containing author and date
...ded as well.
5aed68e 17 hours ago you@me.com Shorten while loops
This is all of course in color, so it is easy to distinguish the various parts of a log line.
Also it is the default when typing git log because of the [format] section.
2014 UPDATE:
Since git now supports padding I have a nice amen...
Run a single migration file
...just run the code directly out of the ruby file:
rails console
>> require "db/migrate/20090408054532_add_foos.rb"
>> AddFoos.up
Note: newer versions of rails may require AddFoos.new.up rather than AddFoos.up.
An alternative way (without IRB) which relies on the fact that require retu...
MySQL check if a table exists without throwing an exception
What is the best way to check if a table exists in MySQL (preferably via PDO in PHP) without throwing an exception. I do not feel like parsing the results of "SHOW TABLES LIKE" et cetera. There must be some sort of boolean query?
...
Is there a command to refresh environment variables from the command prompt in Windows?
... environment variables with a vbs script, but you need a bat script to actually change the current environment variables, so this is a combined solution.
Create a file named resetvars.vbs containing this code, and save it on the path:
Set oShell = WScript.CreateObject("WScript.Shell")
filename =...
Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tp
该语句表示postfix推迟投递所有的邮件直到执行sendmail -q命令，这样
我们就可以在ppp的脚本中加上sendmail -q，以便在拨号成功后让postfix开始投递邮件。
5． 关于延迟邮件的再投递控制
可以通过以下的几个参数实现对延迟邮件...