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Check number of arguments passed to a Bash script
I would like my Bash script to print an error message if the required argument count is not met.
10 Answers
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ProcessStartInfo hanging on “WaitForExit”? Why?
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The problem is that if you redirect StandardOutput and/or StandardError the internal buffer can become full. Whatever order you use, there can be a problem:
If you wait for the process to exit before reading StandardOutput the process can bloc...
Is it better in C++ to pass by value or pass by constant reference?
...ecially true before the existence of move semantics. The reason is simple: if you passed by value, a copy of the object had to be made and, except for very small objects, this is always more expensive than passing a reference.
With C++11, we have gained move semantics. In a nutshell, move semantics...
The point of test %eax %eax [duplicate]
...P subtracts the operands and sets the flags. Namely, it sets the zero flag if the difference is zero (operands are equal).
TEST sets the zero flag, ZF, when the result of the AND operation is zero. If two operands are equal, their bitwise AND is zero when both are zero. TEST also sets the sign flag...
How do you tell if a string contains another string in POSIX sh?
I want to write a Unix shell script that will do various logic if there is a string inside of another string. For example, if I am in a certain folder, branch off. Could someone please tell me how to accomplish this? If possible I would like to make this not shell specific (i.e. not bash only) but i...
How can the Euclidean distance be calculated with NumPy?
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If OP wanted to calculate the distance between an array of coordinates it is also possible to use scipy.spatial.distance.cdist.
– mnky9800n
May 2 '17 at 9:47
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List comprehension with if statement
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You got the order wrong. The if should be after the for (unless it is in an if-else ternary operator)
[y for y in a if y not in b]
This would work however:
[y if y not in b else other_value for y in a]
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Android: Getting a file URI from a content URI?
... Check the scheme of the URI returned to you from the chooser activity. If if uri.getScheme.equals("content"), open it with a content resolver. If the uri.Scheme.equals("file"), open it using normal file methods. Either way, you'll end up with an InputStream that you can process using common code...
Bash array with spaces in elements
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I think the issue might be partly with how you're accessing the elements. If I do a simple for elem in $FILES, I experience the same issue as you. However, if I access the array through its indices, like so, it works if I add the elements either numerically or with escapes:
for ((i = 0; i < ${#...
Linux Shell中 if else及大于、小于、等于逻辑表达式写法 - C/C++ - 清泛网...
Linux Shell中 if else及大于、小于、等于逻辑表达式写法本文简要介绍Linux Shell if条件测试语句的写法，如比较字符串、判断文件是否存在及是否可读等，通常用 "[] "来表示条件测试。注意：if [ xxx ] 表达式前后都要...