大约有 40,000 项符合查询结果（耗时：0.0642秒） [XML]
xxx.sh: line x: [0: command not found - 更多技术 - 清泛网 - 专注C/C++及内核技术
xxx.sh: line x: [0: command not found由于if [后面没有加空格导致的。if [ xxx ] 表达式前后都要有空格。由于if [ 后面没有加空格导致的。
if [ xxx ] 表达式前后都要有空格。command not found
Discuz X 首页白板解决之道 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Discuz X 首页白板解决之道1、开启Debug，及url后面跟 &debug=yes，也是网上最多的方法，但可能往往没有效果。2、排除法，代码一段段的排查，在合适位置打印特定内容然后exit(0);查看结果，分析出现问题的 1、开启Debug，及url后面...
Storing Python dictionaries
...
Pickle save:
try:
import cPickle as pickle
except ImportError: # Python 3.x
import pickle
with open('data.p', 'wb') as fp:
pickle.dump(data, fp, protocol=pickle.HIGHEST_PROTOCOL)
See the pickle module documentation for additional information regarding the pr...
Find value in an array
...
array.select{} will go through all elements in the array looking those which match the condition. array.find instead will return the first element that match the condition. So preferable use array.find{ |e| e == 3 } then array.select{ |e| e == 3 }.first
...
How do I convert a Java 8 IntStream to a List?
...
@skiwi I mean, that all the other answers are unneeded after this one as they would be not so natural.
– Dmitry Ginzburg
May 15 '14 at 9:56
...
What is the difference between \r and \n?
...ngs like \a "bell", \b "backspace" (not to be confused with "delete"), and all the other control characters needed to communicate with a tty.
– erjiang
Aug 14 '09 at 19:48
37
...
Return two and more values from a method
...
def sumdiff(x, y)
return x+y, x-y
end
#=> nil
sumdiff(3, 4)
#=> [7, -1]
a = sumdiff(3,4)
#=> [7, -1]
a
#=> [7, -1]
a,b=sumdiff(3,4)
#=> [7, -1]
a
#=> 7
b
#=> -1
a,b,c=sumdiff(3,4)
#=> [7, -1]
a
#=> 7
b
#=...
Is std::unique_ptr required to know the full definition of T?
...s. However shared_ptr and unique_ptr are partial exceptions. Some, but not all of their members can be instantiated with incomplete types. The motivation for this is to support idioms such as pimpl using smart pointers, and without risking undefined behavior.
Undefined behavior can occur when you h...
Qt: How do I handle the event of the user pressing the 'X' (close) button?
... don't know which slot corresponds to the event of "the user clicking the 'X'(close) button of the window frame" i.e. this button:
...
What is DOM Event delegation?
...ame effect.
So what's the benefit?
Imagine you now have a need to dynamically add new <li> items to the above list via DOM manipulation:
var newLi = document.createElement('li');
newLi.innerHTML = 'Four';
myUL.appendChild(newLi);
Without using event delegation you would have to "rebind" t...