大约有 45,000 项符合查询结果（耗时：0.0685秒） [XML]
Send string to stdin
...
This is coming from the stdin
EOF
or you can redirect output from a command, like
diff <(ls /bin) <(ls /usr/bin)
or you can read as
while read line
do
echo =$line=
done < some_file
or simply
echo something | read param
...
How to list variables declared in script in bash?
In my script in bash, there are lot of variables, and I have to make something to save them to file.
My question is how to list all variables declared in my script and get list like this:
...
图表组件 · App Inventor 2 中文网
...。
对于 加速度传感器，该值应为以下之一：X Y 或 Z
对于 陀螺仪传感器，该值应为以下之一：X Y 或 Z
对于 位置传感器，该值应为以下之一：纬度、经度、高度或速度
对于 方向传感器，该值应为以下之一：俯...
Scala: What is the difference between Traversable and Iterable traits in Scala collections?
I have looked at this question but still don't understand the difference between Iterable and Traversable traits. Can someone explain ?
...
Understanding the map function
Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel.
...
Behaviour of increment and decrement operators in Python
...erator is the identity operator, which does nothing. (Clarification: the + and - unary operators only work on numbers, but I presume that you wouldn't expect a hypothetical ++ operator to work on strings.)
++count
Parses as
+(+count)
Which translates to
count
You have to use the slightly lo...
AJAX POST and Plus Sign ( + ) — How to Encode?
I'm POSTing the contents of a form field via AJAX to a PHP script and using JavaScript to escape(field_contents) . The problem is that any plus signs are being stripped out and replaced by spaces. How can I safely 'encode' the plus sign and then appropriately 'decode' it on the PHP side?
...
Split list into multiple lists with fixed number of elements
...rate question. Scala has a mysterious gnome that chooses a data structure, and it chose a Stream for you. If you want a List, you should request a List, but you can also just trust the gnome's judgment.
– Ion Freeman
Jun 21 '17 at 21:09
...
Why are quaternions used for rotations?
I'm a physicist, and have been learning some programming, and have come across a lot of people using quaternions for rotations instead of writing things in matrix/vector form.
...
How do you detect where two line segments intersect? [closed]
How do I determine whether or not two lines intersect, and if they do, at what x,y point?
27 Answers
...