loops.note

# While i (which is 0) is still 10, do some command etc

i=0    
while [ $i -le 10 ]; do
	echo i:$i
	((i+=1))
done

# Until j (which is set as 0) reaches 10, so some command etc

j=0
until [ $j -ge 10 ]; do
	echo j:$j
	((j+1))
done

# For loop, for every item do something
for i in 1 2 3 
do 
	echo $i
done

# For item in the range 1 to 10, do something
for i in {1..10}
do 
	echo $i
done

# For item  (i is 1, but i is  less or equal to 10, increment i till 10)
for (( i=1; i<=10; i++))
do 
	echo $i
done 

# for each item in an array, do something
arry=("John" "Troon" "Ombagi")
for i in ${arry[@]}
do 
	echo $i
done


# for each item in an associative array, do something

declare -A  arr
arr["name"]="John Troon"
arry["twitter"]="@johntroony"
for i in "${!arr[@]}"
do
	echo "$i: ${arr[$i]}"
done

#for items from a command substitution, do something

for i in $(ls)
do 
	echo "$i"
done