savishy

execute command as another user

sudo -u <user> bash -c "<command to execute>"

list all users in system

savishy

Systems Administration

Killing a Dangling SSH Session.

Background: I had previously SSH'd into a server and CD to directory /opt/foo when I got kicked out by network troubles. A colleague was trying to delete that directory and could not delete it.

• SSH into the server
• Execute who to get the active sessions.
• Try to locate the pts/N session from the list.
• Now execute ps -ef | grep -i sshd and from the list, locate the PID for the SSHD session that has pts/N.

savishy

Git Cheatsheet

A repository of Git commands I find useful.

Further Reading

1. Interesting discussions on avoiding merge conflicts
2. Visual Git Reference
3. Visual Git Workflow

savishy

   [testng] org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command. (Original error: Command failed: C:\WINDOWS\system32\cmd.exe /s /c "D:\vish\adt-bundle\sdk\platform-tools\adb.exe shell "settings get global airplane_mode_on""
   [testng] error: more than one device/emulator
   [testng] ) (WARNING: The server did not provide any stacktrace information)
   [testng] Command duration or timeout: 43 milliseconds
   [testng] Build info: version: 'unknown', revision: 'unknown', time: 'unknown'
   [testng] System info: host: 'freeman', ip: '10.0.0.119', os.name: 'Windows 8.1', os.arch: 'amd64', os.version: '6.3', java.version: '1.8.0_25'
   [testng] Driver info: io.appium.java_client.android.AndroidDriver
   [testng] Capabilities [{appPackage=com.icelero.crunch, networkConnectionEnabled=true, warnings={}, databaseEnabled=false, deviceName=MotoE, uuid=ZX1B33GSLN, platform=LINUX, appActivity=app.CrunchSplashActivity, chromedriverExecutable=C:\Users\vish\AppData\Loca

savishy

2016-03-10 11:58:34:740 - info: Welcome to Appium v1.4.13 (REV c75d8adcb66a75818a542fe1891a34260c21f76a)
2016-03-10 11:58:34:742 - info: Appium REST http interface listener started on 127.0.0.1:4723
2016-03-10 11:58:34:745 - debug: Non-default server args: {"app":"D:\\vish\\ma-app-verification-android\\appium-projects\\AppiumAndroid\\CrunchAPKs\\Crunch.apk","udid":"ZX1B33GSLN","address":"127.0.0.1","log":"C:\\Users\\vish\\AppData\\Local\\Temp\\appium4723.log","loglevel":"warn:debug","localTimezone":true,"androidPackage":"com.icelero.crunch","androidWaitActivity":"app.CrunchSplashActivity","deviceName":"MotoE","platformName":"Android","platformVersion":"5.1","automationName":"Appium","chromeDriverPort":4725,"chromedriverExecutable":"C:\\Users\\vish\\AppData\\Local\\Temp\\\\chromedriver.exe","defaultCommandTimeout":600}
2016-03-10 11:58:34:745 - info: Console LogLevel: warn
2016-03-10 11:58:34:745 - info: File LogLevel: debug
2016-03-10 11:58:35:620 - info: --> GET /wd/hub/status {}
2016-03-10 11:58:35:622 - de

savishy

######################################
# get and set network connection 
######################################

# returns 1 if airplane mode is enabled, 0 otherwise.
adb -s $DEVICE_ID shell settings get global airplane_mode_on

# the same for wifi and mobile data.
adb -s $DEVICE_ID shell settings get global wifi_on
adb -s $DEVICE_ID shell settings get global mobile_data

savishy

#!/bin/bash
set -e

echo "==== rename.sh =====
This script recurses through videos in a folder, and 
renames them into a format as follows:
test_[w]x[h]_[bitrate]_[duration].[extension]
e.g.
test_640x480_2973Kbps_34s.mov

savishy

Docker Images

list all docker dangling images

Dangling images are "no name, no tag" images <none>:<none> created during image building. These images are bad because they consume disk space. Reference.

docker images -f "dangling=true"

savishy

Table of Contents

1. FAQ
2. Commands
3. How Tos

Introduction

This is a list of useful commands in Calabash for Android. The Ruby API is assumed. :exclamation: many of the cheats here are Ruby and not Calabash. This is probably because my Ruby sucks :)

savishy

#!/bin/bash                                                                                                                                                                             
set -e

###########
# AWS CLI Must be installed e.g using sudo apt install awscli.

# This script cleans up your security group to remove old IP addresses from the rules for SSH, and 
# adds your current IP address. 
# This scenario is especially for cases where your ISP only allows dynamic IP addresses, or you 
# access AWS from multiple locations.