odadoda

# Print the third value in the array
echo ${MY_ARRAY[2]}

# To print everyting in the array:
echo ${MY_ARRAY[@]}

# Get array length
echo ${#MY_ARRAY[@]}

# Add more elements

odadoda

if [ test-commands ]; then
    #do something
elif [ more-commands ]; then
    #do more something]
else
    #do something else
fi

odadoda

if ls ; then
    echo “listed all the files”
else
    echo “error”
fi

odadoda

if [ “Foo” == “Foo” ] ; then
    echo “Its equal”
fi

odadoda

$NUMBER=100

if [ $NUMBER -eq 100 ] ; then
    echo “Number is equal”
fi

odadoda

while command ; do
    something
done

odadoda

# for-each
MY_ARRAY=("one", "two", "three")

for i in MY_ARRAY ; do
    echo $i
done

# extended for-loop
for (( i=0; i "-lt" 3; i++ )) ; do
    echo $i

odadoda

case $VAL in
    ( 1 ) echo "The val is 1" ; echo "Echoing out some more text" ;;
    ( 2 ) echo "The val is 2" ;;
    ( * ) echo "The value is not 1 or 2" ;;
esac

# There is a shorter version to case aswell
case $OS in 
    ubuntu ) echo "Running ubuntu" ;;
    centos ) echo "Running centos" ;;

odadoda

# declare a subrutine
kewl(){
    echo "kewl!";
    
    #access arguments in $1, $2 ... etc
    echo "$1"
    
    # declare a local variable
    local LOCAL_IN = 1
}

odadoda

# check if param 1 is not empty and if the file exists
if [ -z $1 ] ; then
    echo "Param 1 missing. Must have a file to present."
    exit
else
    FILE="$1"
fi 

if [ ! -f $FILE ] ; then
   echo "File not found."