#! /bin/bash

# loops are used basical to run list of commands over and over

# while loop syntax:

# while [ condition ]

# do

# command1

# command2

# command3

# done

# Let's print numbers from 1 to 20 with the help of while loop

n=1;

while [ $n -le 20 ] # '-le' less than or equal to

do

echo "$n"

n=$(( n+1 )) # increment the value of n by 1 (you can do post or pre increment also (( n++ ))/(( ++n )))

done

#another way

n=1;

while (( $n <= 20 )) # if you are using doouble (), can't use -le

do

echo "$n"

(( n++ ))

done

#using sleep command with while loop

# n=1;

# while (( $n <= 20 )) # if you are using doouble (), can't use -le

# do

# echo "$n"

# (( n++ ))

# sleep 1 #it pause the loop for 1 second for every iteration

# done

#open multiple terminal using while loop

n=1;

while (( $n <= 3 )) # if you are using doouble (), can't use -le

do

echo "$n"

(( n++ ))

gnome-terminal # gnome-terminal &

done