cd
pwd

cd .
pwd

cd ~
pwd

cd /
pwd

cd no_file
pwd

cd a b c d
pwd

cd $HOME/Documents
pwd

cd ../../../../../..
pwd

cd ..
pwd
/bin/ls

cd notworking

cd .

cd .. 
pwd
/bin/ls
cd .. 
      pwd    
/bin/ls
     cd notworking
     cd .

cd ~

cd ../Desktop

cd poep

mkdir dir
cd dir
pwd

mkdir dir
cd dir
cd .
pwd

mkdir dir
cd dir
cd ./
pwd

mkdir dir
cd dir
cd ..
pwd

mkdir dir
cd dir
cd ../
pwd

touch testfile
cd testfile

cd NO_SUCH_FILE
pwd

cd hello world
pwd

cd /
cd ../../akjwyefgjkwveyjfgweyugyuwegf76t273/../../
pwd

mkdir dir
cd dir
cd ../nosuchdir/../dir
pwd

mkdir hello
cd hello world
pwd

cd /
pwd

mkdir dir
cd DIR
pwd

mkdir DIR
cd dir
pwd

mkdir DIR
cd DIR
pwd

mkdir dir
chmod 000 dir
cd dir
pwd
chmod 777 dir

mkdir dir
cd dir
cd ./
pwd
cd .
pwd
cd ./././././
pwd
cd .////////./
pwd
cd ../
pwd

cd
pwd

export HOME=
cd
pwd

unset HOME
cd
pwd

export HOME="./"
cd
pwd

export HOME="../../"
cd
pwd

export HOME=""
cd
pwd

export HOME="/BIN"
cd
pwd

export HOME=a
mkdir -p a/b
cd
pwd

export HOME=NO_SUCH_FILE
cd
pwd

mkdir -p a/b/c/d/e/f/g/h/i/
cd a/b/c/d/../../c/d/e/f/g/h/i/../../../g/h/i/../.././././../g/h/i/../../../../../../../c/d/../d/../d/e/../../d/e/.././././e/f/.//////../f/g/h/i/////../../../
pwd