No error , No gain

질문자 :Weiwei Yang쉘 프로그램을 작성할 때 /bin/sh 및 /bin/bash 자주 사용합니다. 나는 보통 bash 사용하지만 그들 사이의 차이점이 무엇인지 모르겠습니다. bash 와 sh 의 주요 차이점은 무엇입니까? bash 와 sh 프로그래밍할 때 알아야 할 사항은 무엇입니까?sh가 뭐야? sh (또는 Shell Command Language)는POSIX 표준에서 설명하는 프로그래밍 언어입니다. 많은 구현이 있습니다( ksh88 , dash , ...). bash sh 의 구현으로 간주될 수도 있습니다(아래 참조). sh 는 구현이 아니라 사양이기 때문에 /bin/sh 는 대부분의 POSIX 시스템에서 실제 구현에 대한 심볼릭 링크(또는 하드 링크)입니다. bash 란 무엇입니까? bas..

The command git add [--all|-A] appears to be identical to git add .. Is this correct? If not, how do they differ? This answer only applies to Git version 1.x. For Git version 2.x, see other answers. Summary: git add -A stages all changes git add . stages new files and modifications, without deletions (on the current directory and its subdirectories). git add -u stages modifications and deletions..

How do I concatenate two lists in Python? Example: listone = [1, 2, 3] listtwo = [4, 5, 6] Expected outcome: >>> joinedlist [1, 2, 3, 4, 5, 6] You can use the + operator to combine them: listone = [1,2,3] listtwo = [4,5,6] joinedlist = listone + listtwo Output: >>> joinedlist [1,2,3,4,5,6] Daniel G Python >= 3.5 alternative: [*l1, *l2] Another alternative has been introduced via the acceptance o..

I am looking for a simple Git command that provides a nicely formatted list of all files that were part of the commit given by a hash (SHA-1), with no extraneous information. I have tried: git show a303aa90779efdd2f6b9d90693e2cbbbe4613c1d Although it lists the files, it also includes unwanted diff information for each. Is there another git command that will provide just the list I want, so that ..

I know that I can do: try: # do something that may fail except: # do this if ANYTHING goes wrong I can also do this: try: # do something that may fail except IDontLikeYouException: # say please except YouAreTooShortException: # stand on a ladder But if I want to do the same thing inside two different exceptions, the best I can think of right now is to do this: try: # do something that may fail e..

Is there a way to make the following return true? string title = "ASTRINGTOTEST"; title.Contains("string"); There doesn't seem to be an overload that allows me to set the case sensitivity.. Currently I UPPERCASE them both, but that's just silly (by which I am referring to the i18n issues that come with up- and down casing). UPDATE This question is ancient and since then I have realized I asked f..

Do Android devices have a unique ID, and if so, what is a simple way to access it using Java? Settings.Secure#ANDROID_ID returns the Android ID as an unique for each user 64-bit hex string. import android.provider.Settings.Secure; private String android_id = Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID); Also read Best practices for unique identifiers: https://developer...

Is it possible to add a key to a Python dictionary after it has been created? It doesn't seem to have an .add() method. You create a new key/value pair on a dictionary by assigning a value to that key d = {'key': 'value'} print(d) # {'key': 'value'} d['mynewkey'] = 'mynewvalue' print(d) # {'key': 'value', 'mynewkey': 'mynewvalue'} If the key doesn't exist, it's added and points to that value. If..

Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts per second to over 96,000 inserts per second! Background: We are using SQLite as part of a desktop application. We have large amounts of configuration data stored in XML files that are parsed and loaded into an SQLite database for further processing when the application is initialized. SQLite is idea..

For a web page that exists, but for which a user does not have sufficient privileges (they are not logged in or do not belong to the proper user group), what is the proper HTTP response to serve? 401 Unauthorized? 403 Forbidden? Something else? What I've read on each so far isn't very clear on the difference between the two. What use cases are appropriate for each response? A clear explanation f..