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App Inventor 2 扩展 · App Inventor 2 中文网
...appinventor.mit.edu/
Note: App Inventor extensions are supported only on Android devices running API Level 8 (Android system 2.2 Froyo) and above. This applies to creating extensions, building projects that import extensions, and running packaged APKs of projects that use extensions. Extensions a...
How to read a file into a variable in shell?
...t:
0000000 61 00 0a
0000003
uuencode and udecode are POSIX 7 but not in Ubuntu 12.04 by default (sharutils package)... I don't see a POSIX 7 alternative for the bash process <() substitution extension except writing to another file...
Of course, this is slow and inconvenient, so I guess the r...
write a shell script to ssh to a remote machine and execute commands
...r and run commands in sequence ###########"
ssh -i ~/.ssh/ec2_instance.pem ubuntu@ip_address 'touch a.txt; touch b.txt; sudo systemctl status tomcat.service'
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Possible reasons for timeout when trying to access EC2 instance
...you're using the correct username. It should be one of ec2-user or root or ubuntu. Try them all if necessary.
Private Key
Make sure you're using the correct private key (the one you download or choose when launching the instance). Seems obvious, but copy paste got me twice.
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SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed
...e/curl/curl-ca-bundle.crt'
Note that if you want your code to run on Ubuntu, you need to set the ca_path attribute instead, with the default certificates location /etc/ssl/certs.
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How to compile and run C/C++ in a Unix console/Mac terminal?
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This is the command that works on all Unix machines... I use it on Linux/Ubuntu, but it works in OS X as well. Type the following command in Terminal.app.
$ g++ -o lab21 iterative.cpp
-o is the letter O not zero
lab21 will be your executable file
iterative.cpp is your c++ file
After you run...
In-memory size of a Python structure
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I forgot I had a virtual box with a recent ubuntu on it! That's strange, sys.getsizeof(dict) is 136 for me (python 2.6 running on a kubuntu vm, hosted by OS X, so I am not sure of anything)
– LeMiz
Aug 25 '09 at 23:39
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How to extract epoch from LocalDate and LocalDateTime?
...eTime (also without ZoneId, or with the GMT one) ?
– android developer
Jan 11 '18 at 10:06
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乘着App的创业浪潮 行业短信也迎来了新生和爆发 - 资讯 - 清泛网 - 专注C/C...
...样的技术突破依旧不够，短信验证码不管是用户触发还是系统触发，都是需要调用短信通道接口，短信通道服务商(主观或无意)是否很容易劫持手机号码及内容。最近炒的沸沸扬扬的借贷宝信息泄露、来这投用户信息泄露等问题...
Bash continuation lines
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Doesn't work for me. Ubuntu 16.04. I get two lines instead of expected concatenated one line.
– Penghe Geng
Jul 20 '18 at 15:40
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