pwd a

pwd a b c d

pwd

pwd .

pwd ..

mkdir testt
./testt
cd ./testt
pwd

echo $OLDPWD

echo $OLDPWD
export OLDPWD=/

echo $PWD

echo $PWD
export PWD=/

echo $PWD, mkdir dir; ln -s dir symdir; cd symdir

pwd

pwd
export PWD=/

pwd
mkdir dir
ln -s dir symdir
cd symdir

pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
cd dir
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
cd dir
cd ..
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

cd
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
cd dir
rmdir ../dir
cd ./
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
cd dir
rmdir ../dir
cd ./
cd ././././././//////////./././././././//////./
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
cd dir
rmdir ../dir
cd ./
cd ../
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
ln -s dir link
cd link
rmdir ../dir
cd ./
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
ln -s dir link
cd link
rmdir ../dir
cd ./
cd ../
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir DIR
cd dir
rmdir ../DIR
cd ./
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir DIR
cd dir
rmdir ../DIR
cd ./
cd ../
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
ln -s dir link
cd LINK
rmdir ../dir
cd ./
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=

mkdir dir
ln -s dir link
cd LINK
rmdir ../dir
cd ./
cd ../
pwd
echo $PWD
echo $OLDPWD
export PWD=
export OLDPWD=