shell

问题 I am writing a C# winform application that starts a second process to execute shell commands like "dir" and "ping". I redirect the second process's output so my app can receive the command result. It roughly works fine. The only problem is my winform app receives the command line output as a whole instead of line by line. For example, it has to wait for the external "ping" command to finish (which takes many seconds or longer) and then receives the whole output (many lines) at once. What I

问题 I am writing a C# winform application that starts a second process to execute shell commands like "dir" and "ping". I redirect the second process's output so my app can receive the command result. It roughly works fine. The only problem is my winform app receives the command line output as a whole instead of line by line. For example, it has to wait for the external "ping" command to finish (which takes many seconds or longer) and then receives the whole output (many lines) at once. What I

问题 I am writing a C# winform application that starts a second process to execute shell commands like "dir" and "ping". I redirect the second process's output so my app can receive the command result. It roughly works fine. The only problem is my winform app receives the command line output as a whole instead of line by line. For example, it has to wait for the external "ping" command to finish (which takes many seconds or longer) and then receives the whole output (many lines) at once. What I

问题 Say I have this file. $ cat a.txt c 1002 4 f 1001 1 d 1003 1 a 1001 3 e 1004 2 b 1001 2 I want to sort it by the second column and then by the third column. Column two are numbers, while column 3 can be treated as string. I know the following command works well. $ sort -k2,2n -k3,3 a.txt f 1001 1 b 1001 2 a 1001 3 c 1002 4 d 1003 1 e 1004 2 However, I think sort -k2n a.txt should also work, while it does not. $ sort -k2n a.txt a 1001 3 b 1001 2 f 1001 1 c 1002 4 d 1003 1 e 1004 2 Seems like

问题 Say I have this file. $ cat a.txt c 1002 4 f 1001 1 d 1003 1 a 1001 3 e 1004 2 b 1001 2 I want to sort it by the second column and then by the third column. Column two are numbers, while column 3 can be treated as string. I know the following command works well. $ sort -k2,2n -k3,3 a.txt f 1001 1 b 1001 2 a 1001 3 c 1002 4 d 1003 1 e 1004 2 However, I think sort -k2n a.txt should also work, while it does not. $ sort -k2n a.txt a 1001 3 b 1001 2 f 1001 1 c 1002 4 d 1003 1 e 1004 2 Seems like

问题 Say I have this file. $ cat a.txt c 1002 4 f 1001 1 d 1003 1 a 1001 3 e 1004 2 b 1001 2 I want to sort it by the second column and then by the third column. Column two are numbers, while column 3 can be treated as string. I know the following command works well. $ sort -k2,2n -k3,3 a.txt f 1001 1 b 1001 2 a 1001 3 c 1002 4 d 1003 1 e 1004 2 However, I think sort -k2n a.txt should also work, while it does not. $ sort -k2n a.txt a 1001 3 b 1001 2 f 1001 1 c 1002 4 d 1003 1 e 1004 2 Seems like

问题 I'm new to python and flask and currently working on the Flask Mega-Tutorial, however: I'm stuck getting flask shell to recognize my custom symbols/commands. When I try to access the model User as a symbol by typing flask shell in my virtual environment, I get NameError: name 'User' is not defined . User should return: <class 'application.models.User'> , but shows the error instead. What I don't understand is that the app symbol seems to work fine and returns <Flask 'application'> as it

问题 I'm new to python and flask and currently working on the Flask Mega-Tutorial, however: I'm stuck getting flask shell to recognize my custom symbols/commands. When I try to access the model User as a symbol by typing flask shell in my virtual environment, I get NameError: name 'User' is not defined . User should return: <class 'application.models.User'> , but shows the error instead. What I don't understand is that the app symbol seems to work fine and returns <Flask 'application'> as it

问题 I'm new to python and flask and currently working on the Flask Mega-Tutorial, however: I'm stuck getting flask shell to recognize my custom symbols/commands. When I try to access the model User as a symbol by typing flask shell in my virtual environment, I get NameError: name 'User' is not defined . User should return: <class 'application.models.User'> , but shows the error instead. What I don't understand is that the app symbol seems to work fine and returns <Flask 'application'> as it

问题 I'm new to python and flask and currently working on the Flask Mega-Tutorial, however: I'm stuck getting flask shell to recognize my custom symbols/commands. When I try to access the model User as a symbol by typing flask shell in my virtual environment, I get NameError: name 'User' is not defined . User should return: <class 'application.models.User'> , but shows the error instead. What I don't understand is that the app symbol seems to work fine and returns <Flask 'application'> as it