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Insert a line at specific line number with sed or awk
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OS X / macOS / FreeBSD sed
The -i flag works differently on macOS sed than in GNU sed.
Here's the way to use it on macOS / OS X:
sed -i '' '8i\
8 This is Line 8' FILE
See man 1 sed for more info.
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How to stop app that node.js express 'npm start'
... provides for a stop script too:
npm help npm-scripts
prestop, stop, poststop: Run by the npm stop command.
Set one of the above in your package.json, and then use npm stop
npm help npm-stop
You can make this really simple if you set in app.js,
process.title = myApp;
And, then in scri...
How to fix a locale setting warning from Perl?
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Your OS doesn't know about en_US.UTF-8.
You didn't mention a specific platform, but I can reproduce your problem:
% uname -a
OSF1 hunter2 V5.1 2650 alpha
% perl -e exit
perl: warning: Setting locale failed.
perl: warning: Please...
How can I efficiently download a large file using Go?
...d via http (error checks omitted for brevity):
import ("net/http"; "io"; "os")
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out, err := os.Create("output.txt")
defer out.Close()
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resp, err := http.Get("http://example.com/")
defer resp.Body.Close()
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n, err := io.Copy(out, resp.Body)
The http.Response's Body is a Reader, so you can ...
ImageView 扩展：图片查看器扩展，支持缩放、双击缩放和动画缩放 · App In...
...式？
Q: 如何处理图片加载失败？
Q: 缩放操作会影响性能吗？
Q: 可以同时使用多个 ImageView 实例吗？
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ImageView 扩展
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WheelView 拓展：滚轮选择框扩展，滚轮日历选择框和旋转日历扩展 · App In...
...龄
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滚轮选择框扩展
WheelView, like number picker, but can be ...
Combining Multiple Commits Into One Prior To Push
...n change all but the first to squash, which will tell Git to keep all of those changes, but squash them into the first commit. After you've done that, check out master and merge in your feature branch:
git checkout topical_xFeature
git rebase -i master
git checkout master
git merge topical_xFeature...
Seeing escape characters when pressing the arrow keys in python shell
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On OSX with brew, all I had to do was brew reinstall python3
– Ranhiru Jude Cooray
Sep 16 '17 at 4:01
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See what process is using a file in Mac OS X
...ble to track a file and see which process is touching that file. Is that possible? I know that I can see the list of open processes in activity monitor but I think it's happening to quickly for me to see it. The reason for this is I'm using a framework and I think the system version of the framew...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...和详细信息查询。该扩展经过多年发展，支持从基础WiFi操作到高级网络建议API的各种功能。
功能概述
WiFi Manager扩展提供以下核心功能：
WiFi状态控制（启用/禁用WiFi）
网络信息查询（SSID、BSSID、IP地址等...