var-bin

#!/bin/bash
# while.sh

again="yes"

while [ "$again" = "yes" ]
do
 echo "Please enter a name:"
 read name # !!!
 echo "The name you entered is ${name}"

var-bin

while [ condition ]
do
  # an action, while condition is true
done

var-bin

#!/bin/bash

for i in 1 2 3 4 5
do
  file_name="file${i}.txt"
  if [[ -e "$file_name" ]]
  then
    continue
  fi
  echo "Creating file ${file_name}"

var-bin

for i in array
do
  # an action, i on every iteration is getting
  # the next value from array
done

var-bin

#!/bin/bash

# ./case_in_esac.sh 2 1
# Creating dir 1
# ./case_in_esac.sh 1 2
# Creating file 2

if [[ "$#" -ne 2 ]]
then
 echo "You should specify exactly two arguments!"

var-bin

#!/bin/bash

if [[ -f "$1" ]]
then
  echo "Removing file ${1}"
  rm "$1"
elif [[ -d "$1" ]]
then
  echo "Removing dir ${1}"
  rm -r "$1"

var-bin

if [[ condition ]]
then
  # action, if condition is true
else
  # action, if condition is false
fi

var-bin

! # denial of boolean expression
&& # boolean "and"
|| # boolean "or"

var-bin

-e <path> # path is exist
-f <path> # is file
-d <path> # is directory
-s <path> # file size more than 0
-x <path> # file is executable

var-bin

<numbers/strings> operation <numbers/strings>
-eq, (==) # equal
-ne, (!=) # not equal
-lt, (<) # less than
-le # less than or equal
-gt, (>) # more than
-ge # more than or equal