gwsu2008

Environment variables
The git plugin sets several environment variables you can use in your scripts:

GIT_COMMIT - SHA of the current
GIT_BRANCH - Name of the remote repository (defaults to origin), followed by name of the branch currently being used, e.g. "origin/master" or "origin/foo"
GIT_LOCAL_BRANCH - Name of the branch on Jenkins. When the "checkout to specific local branch" behavior is configured, the variable is published.  If the behavior is configured as null or **, the property will contain the resulting local branch name sans the remote name. 
GIT_PREVIOUS_COMMIT - SHA of the previous built commit from the same branch (not set on first build on a branch)
GIT_PREVIOUS_SUCCESSFUL_COMMIT - SHA of the previous successfully built commit from the same branch (not set on first build on a branch)
GIT_URL - Repository remote URL
GIT_URL_N - Repository remote URLs when there are more than 1 remotes, e.g. GIT_URL_1, GIT_URL_2

gwsu2008

set -e causes the shell to exit whenever a pipeline, list, or compound command exits with non-zero status;
set -u causes the shell to exit whenever it attempts to expand a parameter which isn't defined.
set -o pipefail If set, the return value of a pipeline is the value of the last (rightmost) command to exit with  a  non-zero  status,  or
       zero if all commands in the pipeline exit successfully.  This option is disabled by default.

gwsu2008

sudo yum groupinstall "Development Tools"
sudo yum install make glibc-devel gcc patch
sudo yum install gcc-c++
sudo yum install openssl-devel

update-alternatives --config gcc ( choose gcc48)

 /usr/local/bin/virtualenv test-env
 source test-env/bin/activate

gwsu2008

xcodebuild -list -workspace BaseNetworkConcept.xcworkspace/ -json

gwsu2008

Most common Bash date commands for timestamping
From time to time I get asked how to use the date command to generate a timestamp. Here is an idiot-friendly script you can post for reference in your team’s bin/ if you get interrupted about timestamp questions or have an aversion to typing phrases like “man date” (with or without a space).

All but the first one and last three produce filename-friendly strings.

A big thanks to the following folks for pointing out mistakes and suggesting useful format inclusions:

2013-05: Rich for the reminder to include UTC and timezoned stamps.
2017-10: “Hamilton and Meg” (haha!) for pointing out I had my 4 year example formats messed up and for prodding me to include a 2-year example.
2018-01: Autumn Gray for suggesting that I add examples of including short and long days of the week.

gwsu2008

Thread.getAllStackTraces().keySet().each() {
    if (it.name.contains('JOB_NAME')) {  
      println "Stopping $it.name"
      it.stop()
    }
}

gwsu2008

import json
import boto3

def lambda_handler(event, context):
    client = boto3.client('s3')

    res = client.get_object(Bucket='szabgab', Key='abc.json')
    content = res["Body"].read()
    data = json.loads(content)
    

gwsu2008

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-initialize.html

gwsu2008

sudo dd if=/dev/zero of=/swapfile count=4096 bs=1MiB
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
swapon -s

/etc/fstab
/swapfile   swap    swap    sw  0   0

gwsu2008

#!/bin/bash
if [ -z "$1" ]; then
  echo "Usage: sudo $0 /dev/sdh1"
  exit 1;
fi

dd if=$1 of=/dev/null & pid=$!
while true; do
  ps -p$pid --no-heading || break;
  echo "-- $(date) ------------------";