## Shebang

    #!/bin/bash

## Comments

    # This is a comment

## Strings

    STRING="Hello World"
    'Single and
    multi-line strings are supported.'
    "Single and
    multi-line strings are supported."
    cat << EOF
    Here-Documents
    are also supported
    EOF

## Variables

    echo $STRING
    args=("$@")
    echo ${args[0]} ${args[1]} ${args[2]}

## Keywords

    for (( i=0;i<$ELEMENTS;i++)); do
    	echo ${ARRAY[${i}]}
    done
    while read LINE; do
        ARRAY[$count]=$LINE
        ((count++))
    done
    if [ -d $directory ]; then
    	echo "Directory exists"
    else
    	echo "Directory does not exists"
    fi

## Some well-known commands

    crontab -l -u USER | grep -v 'YOUR JOB COMMAND or PATTERN' | crontab -u USER -

    groups user1 user2|cut -d: -f2|xargs -n1|sort|uniq -d

    wget -q -O - http://www.example.com/automation/remotescript.sh | bash /dev/stdin parameter1 parameter2

    sudo dpkg -i vagrant_1.7.2_x86_64.deb

    git pull origin master

    sudo gpg --refresh-keys; sudo apt-key update; sudo rm -rf /var/lib/apt/{lists,lists.old}; sudo mkdir -p /var/lib/apt/lists/partial; sudo apt-get clean all; sudo apt-get update