ulimit -n

cat Makefile | grep pr | head -n 5 | cd test (mybin)
echo $?

cat Makefile | grep pr | head -n 5 | cat test (bin)
echo $?

cat Makefile | grep pr | head -n 5 | hello (NA)
echo $?


#---------------------------------------------
# Race condition, unpredictable behaviour
echo DOET HET NIET > test1 | cat test1


#----------------------------------------------
# ; Semicolon separator

echo hallo | echo poep >x1 >x2
echo hallo ; echo poep >x1 >x2

echo hallo | echo hoi > y1 >y2 ; cat -e
echo "hello | this is some stuff > touch this file" | grep more

echo bonjour ; |

echo bonjour |;

;

echo coucou | ;

echo ;;


#----------------------------------------------
# Export builtins

export | grep -e "HOME="

export | grep -e "PWD="

export a="\\"

export

# var without export
POEP=directory1
MEERPOEP=directory2

export PATH="test:working:multiplepath:directory1:directory2"
env


#----------------------------------------------
# CD builtins

export CDPATH="/"
cd bin
pwd

export CDPATH="/"
cd
pwd

export CDPATH="/"
export HOME=
cd
pwd

export CDPATH="/"
unset HOME
cd
pwd

export CDPATH=""
mkdir -p a/b
cd b
pwd

export CDPATH="./"
mkdir dir
cd dir
pwd

export CDPATH="../a"
mkdir -p a/b/c
cd b
pwd
cd a
pwd
cd b
pwd

export CDPATH=a
mkdir -p a/b/c
cd b
pwd

export CDPATH=A
mkdir -p a/b/c
cd b
pwd

export CDPATH=a
mkdir -p a/b/c
cd ./b
pwd

export CDPATH=a
mkdir -p a/b/c
cd a
cd ../b
pwd

export CDPATH=a
mkdir -p a/b/c
cd .
pwd

export CDPATH=a
mkdir -p a/b/c
cd a
cd ..
pwd

export CDPATH=a
mkdir -p a/b/c
mkdir b
cd b
pwd

export CDPATH=a/b
mkdir -p a/b/c
cd c
pwd

export CDPATH=a:b:a:b
mkdir -p a/test  b/test
mkdir -p a:b/test
cd test
pwd

export CDPATH=b:a:a:b
mkdir -p a/test  b/test
mkdir -p a:b/test
cd test
pwd

export CDPATH=a:b:a:b
mkdir -p a/hello  b/hello
mkdir -p a:b/test
cd test
pwd

export CDPATH=a:b:a:b
mkdir -p a/test  b/test
mkdir -p a:b/test
chmod 000 a/test
cd test
pwd
cd ../../
chmod 777 a/test

export CDPATH="/"
cd /
pwd

export CDPATH="/"
cd /bin
pwd

export CDPATH="/bin"
cd /bin
pwd

export CDPATH="/bin"
cd /bin
pwd

export CDPATH="a"
mkdir a
cd a
pwd

export CDPATH="a"
mkdir -p a/a
cd a
pwd

export CDPATH=//
cd bin

export CDPATH=//bin/..////////////bin/../
cd bin

export CDPATH=///
cd bin

export CDPATH=":"
cd dir
pwd

export CDPATH="hello:"
cd dir
pwd

export CDPATH=":/"
cd dir
pwd

export CDPATH="::/"
cd bin
pwd

export CDPATH="::/:"
cd bin
pwd

export CDPATH=""
cd bin
pwd

export CDPATH="/:"
cd bin
pwd

export CDPATH="//::"
cd bin
pwd


#----------------------------------------------
# special characters

echo "$222"

echo "hallo$USER***$USER$2$"

echo "$53535"

echo $53535

echo "$5fsdlfjlfj"

echo $1


#----------------------------------------------
# expansions with quotes $""

echo $"USER"

echo $"etet"

echo $"hallo"

echo /$"123$USER"

echo hallo$"USER"

echo hallo$"POEP"

echo hallo$'USER'

echo $""

echo $"nothing"

echo $"$USER"


#----------------------------------------------
# ' " single quotes

echo hallo 'ma'ran' siemons

echo hallo 'ma\"ran' siemons

echo hallo 'ma\'ran'' siemons

echo "hallo"maran"

echo hallo"

echo poep"

echo poep"""

echo hallo"\poep

echo " " "

echo "

echo """

echo '

echo $USER"

echo "$USER

echo hallo$'USER' '

echo $USER'	

echo $USER'	

echo $'	

echo $'	' '

echo $"USERhallo"



#----------------------------------------------
# \ Backslash

echo "bip | bip ; coyotte > < \" "

echo bonjour > test\ 1
ls
rm test

echo bonjour \; ls

echo \"test\"

echo "123\"456"

echo poep\'

echo "poep\"

echo "hallo\"\poep"

#echo "\$"

#echo "\""

#echo \'1234'

#echo \hallo

#echo "123\$456"

#echo "123\\456"

#echo “$\hallo”

#echo $"\hallo"

#echo "\\hallo"

#echo "hallo\\hoi"

#echo "\\$USER"

#echo "123\"456"

#echo "hallo\"\poep"			

#echo hallo$\\abc

#echo hallo$\abc

#echo hallo$\abc

#echo '$USER'$USER\$USER/"$USER"

#echo \$?

#echo \"

#echo \poep

#echo "123\'456"

#echo 123\'456

#echo "'\$USER'"

#echo "\$USER"

#echo "123\"456"

#echo "poep\'"

#echo "poep\""

#echo "\$USER"

#echo \$USER

#echo \$?

#echo hallo\$USER

#echo ma\

#echo 'ma\'									Hij ziet de \ niet als escape, print gewoon \

#echo 'ma\'									Hij ziet de \ niet als escape, print gewoon \

#echo hallo ma\"ran siemons

#echo hallo 'ma\'ran' siemons

#echo    "\""

#echo   \'

#echo \n ' \n this is the; "first line"'

#echo 00\\\'pp

#echo \$HOME

#echo "\\s"

#echo "\n \\n \\\n"

#echo \>

#echo 00\\\\\'pp

#echo 00\\\\'pp'

echo   \\

echo "\\"

echo \poep

echo \1

echo 123\!456

echo 123\456

echo "\"

echo   \" "\\"    "\""   \\   \'   \"

echo "\\"

echo \"1234"

echo "1234\"

echo "1234\\"

echo "\\"

echo \a
echo \b
echo \c
echo \d
echo \e
echo \!
echo \"
echo \#
echo \$
echo \%
echo \&
echo \'
echo \(
echo \)
echo \*
echo \+
echo \,
echo \-
echo \.
echo \/
echo \0
echo \1
echo \2
echo \3
echo \4
echo \5
echo \6
echo \7
echo \8
echo \9
echo \:
echo \=
echo \?
echo \@
echo \A
echo \B
echo \C
echo \D
echo \E
echo \F
echo \G
echo \H
echo \I
echo \J
echo \K
echo \L
echo \M
echo \N
echo \O
echo \P
echo \Q
echo \R
echo \S
echo \T
echo \U
echo \V
echo \W
echo \X
echo \Y
echo \Z
echo \[
echo \\
echo \]
echo \^
echo \_
echo \a
echo \b
echo \c
echo \d
echo \e
echo \f
echo \g
echo \h
echo \i
echo \j
echo \k
echo \l
echo \m
echo \n
echo \o
echo \p
echo \q
echo \r
echo \s
echo \t
echo \u
echo \v
echo \w
echo \x
echo \y
echo \z
echo \{
echo \}
echo \~