CLI_drill_1.sh

mkdir hello                           #creating directory hello 
cd hello                              #move to directory hello       
mkdir five one                        #creating directory five and one in hello
cd five                               #move to directory five
mkdir six                             #creating directory six
cd six                                #move to directory six
touch c.txt                           #creating c.txt file using touch command in six
mkdir seven                           #creating directory seven
cd seven                              #move to directory seven
touch error.log                       #creating error.log file using touch command in seven
cd ~                                  #moved to root
cd desktop                            #moved to desktop
cd ~                                  #moved to root again
cd ~/desktop/hello/one                #moved to directory one from root 
touch a.txt b.txt                     #creating a.txt and b.txt file simultaneously
mkdir two                             #creating directory two
cd two                                #move to directory two
touch d.txt                           #creating d.txt file using touch commands
mkdir three                           #creating directory three using mkdir
cd three                              #move to three folder
touch e.txt                           #creating e.txt file in three folder
mkdir four                            #creating directory four
touch access.log                      #creating access.log file in four directory
cd /                                  #moved to root directory
cd ~/desktop/hello/one/two/three      #moved to directory three
rm access.log                         #deleting the access.log file from three
ls -l                                 #reading the all files and folder present in directory three
cd four                               #move to directory four
touch access.log                      #creating the access.log file again in four directory
rm access.log                         #now delete the access.log file from four
ls -l                                 #checking the file present after deletion in four directory
cd ..                                 #move one step back in directory now i am in directory three
cd ../../                             #move two step back in directory. Reached at one 
cd ..                                 #move one step back in directory now i at in hello folder
cd five/six/seven                     #now moved to directory seven
rm error.log                          #remove error.log file which is present in seven
ls -l                                 #see the files present in seven
cd ../../../                          #move back three step reached at hello
cd one                                #now move to one directory

#write some text into a.txt file using echo commands
echo "Unix is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others" > a.txt

cat a.txt                             #checked whether it's written in a.txt or not
cd ../five                            #moved to directory five
cd ..                                 #move one step back
rm -R five                            #remove whole five directory recursivly
ls -l                                 #checked whether it's present or not
mv one uno                            #rename the one folder to uno
ls                                    #check for rename
cd uno                                #moved to uno
mv a.txt two                          #moved the a.txt file from uno to two folder
cd two                                #moved two two
ls                                    #checked for a.txt is present in two or not