odadoda

current_line=$(awk "NR==$current_row" "$FILE")

odadoda

## wait for input
read -n 1 -s INPUT

#  Valid input:
#  
#  m: next line / slide
#  n: previous slide
#  q: quit presenter
while [ "$INPUT" != "q" ]; do

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."

odadoda

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

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

echo $PATH

odadoda

ls /bin

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

while command ; do
    something
done

odadoda

$NUMBER=100

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