bsnux

Bash cheatsheet

Google Shell Style Guide

Output

echo "Hello World"
printf "Hello World\n"

bsnux

#!/bin/bash

# Print only lines matching expression
awk -F: '/ssh/ { print } ' /etc/group

# Print only if field 4 matchs expression
awk -F: 'match($4,/ssh/) { print } ' /etc/group

# Print field 1 only if field 4 matchs expression
awk -F: 'match($4,/ssh/) { print $1 } ' /etc/group

bsnux

#!/bin/bash
#----------
# simple-cheatsheet.sh
#
# source: https://devhints.io/bash
#
#----------

# Variables
NAME="John"

bsnux

#!/bin/bash
#-------------------------------------------------
#
# Create Ansible directory structure
#
# Reference: https://docs.ansible.com/ansible/latest/user_guide/playbooks_best_practices.html#content-organization
#
#-------------------------------------------------
role_name=$1

bsnux

dig +short myip.opendns.com @resolver1.opendns.com

bsnux

import java.util.ArrayList


def MULTIBRANCH_JOBNAME = "project"
def BRANCH_NAME = "develop"
def MAX_TO_KEEP = 10

def hi = hudson.model.Hudson.instance
def item = hi.getItemByFullName(MULTIBRANCH_JOBNAME)
def jobs = item.getAllJobs()

bsnux

#!/bin/bash
# help-template.sh
#
# Simple template for shell scripts
#
Help=$(cat <<-"HELP"
my-script — does one thing well

Usage:
  my-script <input> <output>

bsnux

set listchars=space:_,tab:>~ list

bsnux

#!/bin/bash
#--------------------------------------------------------------
#        perl-compile.sh
#
#  Generates a binary file for Linux from a Perl file
#
#  Usage: perl-compile.sh myfile.pl
#--------------------------------------------------------------
set -e

bsnux

FROM alpine:3.7

LABEL desc="Simple image for delivering shell script with no dependencies"
LABEL author="bsnux"
LABEL tag="1.0"

ADD your-script-here.sh /opt/your-script-here.sh

RUN apk update \
    && apk add \