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minishell_tests.txt
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minishell_tests.txt
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#basic
ls
ls -la
/usr/bin/ls
usr/bin/ls
./ls
hello
/usr/bin/hello
./hello
""
.
..
$
./
../
./existing_dir
../fake_dir/
./existing_file
./nonexistant_file
./executable_file
.executable_file
executable_file
#basic-no-env
unset PATH; pwd
unset PATH; echo hello
unset PATH; /usr/bin/ls
unset PATH; usr/bin/ls
unset PATH; ./ls
unset PATH; hello
unset PATH; /usr/bin/hello
unset PATH; ./hello
unset PATH; ""
unset PATH; .
unset PATH; ..
unset PATH; $
unset PATH; ./
unset PATH; ../
unset PATH; ./existing_dir
unset PATH; ../fake_dir/
unset PATH; ./existing_file
unset PATH; ./nonexistant_file
unset PATH; ./executable_file
unset PATH; .executable_file
unset PATH; executable_file
#spaces
""
" "
\t\t\t\t\t\t\t\t\t\t
\t\n\r\v\f
\t \t\t\t
ls
ls
ls
ls\t\t\t\t\t\t\t\t\t\t\t\t
\t\t\t\t\t\tls\t\t\t\t\t\t
\t\t\t\t\t\t\t\t\t\t\t\tls
\t\t\t\t \t\tls
ls -l -a
\t\tls\t\t\t\t-l\t\t\t\t-a
\t ls\t\t -l -a\t\t
#pipes
ls -l | wc -l
cat valid_infile_1 | grep dream
cat valid_infile_1 | grep dream | cat -e
cat valid_infile_1 | grep dream | wc -l
cat valid_infile_1 | grep dream | wc -l | cd x
cat valid_infile_1 | grep dream | wc -l | x
x | cat valid_infile_1 | grep dream | wc -l
cat valid_infile_1 | x | grep dream | wc -l
cat valid_infile_1 | grep dream | x | wc -l
cat /dev/random | head -c 100 | wc -c
x | x | x | x | x
x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x|x
ls | ls | ls
ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls|ls
#quotes
ec""ho test
ec''ho test
""echo test
''echo test
echo"" test
echo'' test
echo "" test
echo '' test
echo "" "" "" test
echo '' '' '' test
echo """""" test
echo '''''' test
echo $USE""R
echo $USE''R
echo ""$USER
echo ''$USER
echo "$"USER
echo '$'USER
echo $""USER
echo $''USER
echo $USER"" ''
echo "cat valid_infile_1 | cat > outfile1"
echo 'cat valid_infile_1 | cat > outfile1'
ls ""
ls '"
ls "'
ls " "
ls " ' "
"ls"
l"s"
#env-variables
$USER
ls $HOME
echo $
echo $$
echo $$$
echo $USER
echo $USE
echo $USE_
echo "$USER"
echo '$USER'
echo "|$USER|"
echo '|$USER|'
echo $USER $USER $USER
echo $USER$USER$USER
echo "$USER $USER $USER"
echo "$USER$USER$USER"
echo '$USER $USER $USER'
echo '$USER$USER$USER'
echo $USERhello
echo hello$USER
echo "$USERhello"
echo "hello$USER"
echo '$USERhello'
echo 'hello$USER'
echo hello $USER
echo hello $NOT_A_VAR $NOT_A_VAR $NOT_A_VAR $USER
echo $NOT_A_VAR $NOT_A_VAR $NOT_A_VAR $USER
echo hello $NOT_A_VAR $NOT_A_VAR $NOT_A_VAR
echo "hello $NOT_A_VAR $NOT_A_VAR $NOT_A_VAR $USER"
export ECHO=echo; $ECHO $ECHO
export L="ls -la"; $L
export L='ls -la'; $L
#syntax
|
||
|||
<
<<
<<<<<<
>
>>
>>>
>>>>>>
ls |
ls ||
ls | |
| ls
| ls | cat
ls | cat |
ls || cat
ls | | cat
fake_cmd |
| fake_cmd
fake_cmd || ls
fake_cmd | | ls
ls || fake_cmd
ls | | fake_cmd
ls >>
ls >
ls <
ls <<
ls < |
ls << |
ls > |
ls >> |
ls | <
ls | <<
ls | >
ls | >>
ls > >
ls > >>
ls > <
ls > <<
ls >> >
ls >> >>
ls >> <
ls >> <<
ls < >
ls < >>
ls < <
ls < <<
ls << >
ls << >>
ls << <
ls << <<
ls > >> |
< < valid_infile_1 cat
<< << valid_infile_1 cat
<< < valid_infile_1 cat
< << valid_infile_1 cat
< $FAKE_VAR cat
cat < $FAKE_VAR
cat < $123456
< $USER cat
echo hello | ;
ls > <
#echo
ECHO
Echo
echo
echo hello
echo hello
echo hello world
echo hello world
echo hello world
echo hello world
echo helololollllolllolol loollolllololllol lllol looololololollllloooolll
echo helololollllolllolol loollolllololllol lllol looololololollllloooolll
echo -n
echo -n hello world
echo hello world
echo hello world
echo -n hello world
echo -n helololollllolllolol loollolllololllol lllol looololololollllloooolll
echo -n helololollllolllolol loollolllololllol lllol looololololollllloooolll
echo hello -n
echo hello world
echo -n hello world
echo a '' b '' c '' d
echo a "" b "" c "" d
echo -n a '' b '' c '' d
echo -n a "" b "" c "" d
echo -nhello world
echo -n -n -n hello world
echo -n -n -nnnn -nnnnm
echo a -nnnnhello
echo -n -nnn hello -n
echo a hello -nhello
#echo-no-env
unset PATH; echo hello world
unset PATH; echo $USER
unset PATH; echo $PATH
#env
ENV | sort | grep -v SHLVL | grep -v _=
Env | sort | grep -v SHLVL | grep -v _=
env | sort | grep -v SHLVL | grep -v _=
env | wc -l
env | grep PATH
#env-no-env
unset PATH; env | grep PATH
unset PATH; env | grep USER
unset PATH; env | grep SHELL
unset PATH; env | grep PWD
#export
EXPORT
Export
export ""
export 42
export 42; env | grep 42=
export =
export =; env | grep = | wc -l
export A
export A=; echo $A
export A=a; echo $A
export A=a B=b C=c; echo $A$B$C
export A=a B=b C=c; export A=c B=a C=b; echo $A$B$C
export A=a B=b C=c D=d E=e F=f G=g H=h I=i J=j K=k L=l M=m N=n O=o P=p Q=q R=r S=s T=t U=u V=v W=w X=x Y=y Z=z; echo $A$B$C$D$E$F$G$H$I$J$K$L$M$N$O$P$Q$R$S$T$U$V$W$X$Y$Z
export A==a; echo $A
export A===a; echo $A
export A====a; echo $A
export A=====a; echo $A
export A======a; echo $A
export A=a=a=a=a=a; echo $A
export HELLOWORLD=a; echo $HELLOWORLD
export helloworld=a; echo $helloworld
export hello_world=a; echo $hello_world
export HELLOWORLD1=a; echo $HELLOWORLD1
export H1ELL_0_W123Orld_a=a; echo $H1ELL_0_W123Orld_a
export a0123456789=a; echo $a0123456789
export abcdefghijklmnopqrstuvwxyz=a; echo $abcdefghijklmnopqrstuvwxyz
export __________________________=a; echo $__________________________
export _hello_=a; echo $_hello_
export 1
export 1=
export 1=a
export HELLOWORLD =a
export HELLOWORLD= a
export HELLO'WORLD'=a
export HELLO"WORLD"=a
export HELLO$WORLD=a
export HELLO_WORLD=a
export A='hello this world is wonderful'; echo $A
export A="hello this world is wonderful"; echo $A
export A 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf ' C; echo $A$B$C
export 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf ' C; echo $A$B$C
export A 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf '; echo $A$B$C
export A B C; echo $A$B$C
export 'HELLO@'=hello
export "HELLO'"=hello
export 'HELLO"'=hello
export 'HELLO$'=hello
export 'HELLO!'=hello
export 'HELLO|'=hello
export 'HELLO&'=hello
export 'HELLO\\'=hello
export ALPHA="abc def ghi"; echo $ALPHA
export ALPHA='abc def ghi'; echo $ALPHA
export DIGITS="0 1 2 3 4 5 6 7 8 9"; echo $DIGITS
export DIGITS='0 1 2 3 4 5 6 7 8 9'; echo $DIGITS
export DIGITS=0 1 2 3 4 5 6 7 8 9; echo $DIGITS
#export-no-env
unset PATH; export hello=42
unset PATH; export 42=hello
unset PATH; export hello=42; echo $hello
unset PATH; export PATH=/usr/bin:/sbin/; ls
#unset
UNSET
Unset
unset
unset PATH
unset PATH USER; echo $PATH; echo $USER
unset PATH; echo $PATH
unset PATH; ls
unset NOT_A_VAR
unset ""
unset ''
export A=a; unset A; echo $A
export A=a A2=a; unset A; echo $A $A2
export A=a; unset 'A '; echo $A
export A=a; unset A=; echo $A
export A=a; unset 'A='; echo $A
export A=a B=b C=c; unset A B C; echo $A$B$C
export A=a B=b C=c; unset A 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf ' C
export A=a B=b C=c; unset A 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf ' C; echo $A$B$C
export A=a B=b C=c; unset 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf ' C
export A=a B=b C=c; unset 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf ' C; echo $A$B$C
export A=a B=b C=c; unset A 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf '
export A=a B=b C=c; unset A 'asdf ' B ' asdf asdf asd f' ' asdf ' '' 'asdf '; echo $A$B$C
export A=a B=b C=c; unset A
export A=a B=b C=c; unset A; echo $A$B$C
export A=a B=b C=c; unset B
export A=a B=b C=c; unset B; echo $A$B$C
export A=a B=b C=c; unset C
export A=a B=b C=c; unset C; echo $A$B$C
unset 'HELLO@'
unset "HELLO'"
unset 'HELLO"'
unset 'HELLO$'
unset 'HELLO!'
unset 'HELLO|'
unset 'HELLO&'
unset 'HELLO\\'
#unset-no-env
unset PATH
unset PATH; export hello=42; unset hello
unset PATH; export hello=42; unset hello; echo $hello
unset PATH; unset USER
#pwd
PWD
Pwd
pwd
pwd | cat -e
pwd hello
pwd 123
pwd 1 2 x 3 hello
pwd .
pwd ..
unset PWD; pwd | cat -e
unset OLDPWD; pwd | cat -e
unset PWD OLDPWD; pwd | cat -e
export PWD='hello/world'; pwd | cat -e
export PWD='/hello/world/'; pwd | cat -e
export PWD='/usr/bin/'; pwd | cat -e
export OLDPWD=abc/def; pwd | cat -e
export PWD=hello/world OLDPWD=abc/def; pwd | cat -e
mkdir a a/b; cd a/b; rm -rf ../../a; pwd
#pwd-no-env
unset PATH; pwd
unset PATH; pwd
unset PATH; unset PWD; pwd
unset PATH; unset OLDPWD; pwd
unset PATH; unset PWD OLDPWD; pwd
unset PATH; export PWD='hello/world'; pwd
unset PATH; export PWD='/hello/world/'; pwd
unset PATH; export PWD='/usr/bin/'; pwd
#cd
CD
CD; pwd
Cd
Cd; pwd
cd
cd; pwd
cd .
cd .; pwd
cd ..
cd ..; pwd
cd existing_dir
cd existing_dir; pwd
cd /dev
cd /dev; pwd
cd /Users
cd /Users; pwd
cd fake_dir
cd fake_dir; pwd
cd forbidden_dir
cd forbidden_dir; pwd
cd existing_file
cd existing_file; pwd
cd forbidden_file
cd forbidden_file; pwd
cd ../../../../../../../../../../../../../../../../../../../../../../
cd ../../../../../../../../../../../../../../../../../../../../../../; pwd
cd $HOME
cd $HOME; pwd
unset HOME; cd $HOME
unset HOME; cd $HOME; pwd
unset HOME; cd
unset HOME; cd; pwd
mkdir a a/b; cd a/b; rm -rf ../../a; cd ..
mkdir a a/b; cd a/b; rm -rf ../../a; unset PWD OLDPWD; cd ..
#cd-no-env
unset PATH; cd
unset PATH; cd; pwd
unset PATH; cd .
unset PATH; cd .; pwd
unset PATH; cd ..
unset PATH; cd ..; pwd
unset PATH; cd existing_dir
unset PATH; cd existing_dir; pwd
unset PATH; cd /dev
unset PATH; cd /dev; pwd
unset PATH; cd /Users
unset PATH; cd /Users; pwd
unset PATH; cd fake_dir
unset PATH; cd fake_dir; pwd
unset PATH; cd forbidden_dir
unset PATH; cd forbidden_dir; pwd
unset PATH; cd existing_file
unset PATH; cd existing_file; pwd
unset PATH; cd forbidden_file
unset PATH; cd forbidden_file; pwd
unset PATH; cd $HOME
unset PATH; cd $HOME; pwd
unset PATH; unset HOME; cd $HOME
unset PATH; unset HOME; cd $HOME; pwd
unset PATH; unset HOME; cd
unset PATH; unset HOME; cd; pwd
#exit
exit
Exit
EXIT
exit 42
exit 42; echo "Should have exited."
exit 240
exit +42
exit -42
exit 00000000000000000000000000000000000000000000001
exit 00000000000000000000000000000000000000000000000
exit -00000000000000000000000000000000000000000000001
exit -00000000000000000000000000000000000000000000000
exit abc
exit abc; echo "Should have exited."
exit --42
exit ++42
exit - 42
exit + 42
exit "0"
exit '0'
exit ""
exit ''
exit " "
exit ' '
exit ' 5'
exit '\t5'
exit '\t\f\r5'
exit '5 '
exit '5\t'
exit '5\t\f\r'
exit '5 x'
exit '5\t\t\tx'
exit 42 41
exit 42 abc
exit abc 42
exit 2147483647
exit 2147483648
exit -2147483648
exit -2147483649
exit 9223372036854775807
exit -9223372036854775808
exit 9223372036854775808
exit -9223372036854775810
exit 9999999999999999999999999999999999999999999999
exit -9999999999999999999999999999999999999999999999
exit _0
exit 0_
exit 5 < valid_infile_1
exit 1 | exit 0
exit 0 | exit 1
ls | exit
ls | exit 42
ls | exit 12 abc
ls | exit abc 12
exit | ls
exit 42 | ls
exit 12 abc | ls
exit abc 12 | ls
ls > file | exit
ls -l > x | exit | wc -l
#exit-no-env
unset PATH; exit
unset PATH; exit 42
unset PATH; exit 42; echo "Should have exited."
unset PATH; exit +42
unset PATH; exit -42
unset PATH; exit 00000000000000000000000000000000000000000000001
unset PATH; exit 00000000000000000000000000000000000000000000000
unset PATH; exit abc
unset PATH; exit abc; echo "Should have exited."
unset PATH; exit --42
unset PATH; exit ++42
unset PATH; exit - 42
unset PATH; exit + 42
unset PATH; exit 9999999999999999999999999999999999999999999999
unset PATH; exit -9999999999999999999999999999999999999999999999
#infile
< valid_infile_1 cat
<valid_infile_1 cat
cat < valid_infile_1
cat <valid_infile_1
< valid_infile_1; echo $?
< file_does_not_exist
< forbidden_file
cat <
cat < file_does_not_exist
cat < file_does_not_exist
< file_does_not_exist cat
<file_does_not_exist cat
cat < forbidden_file
cat <forbidden_file
< forbidden_file cat
<forbidden_file cat
< file_does_not_exist < valid_infile_1 cat
cat < valid_infile_1 < file_does_not_exist
cat < valid_infile_1 < valid_infile_1 < valid_infile_1
cat < valid_infile_1 <
cat < valid_infile_1 < valid_infile_2
<valid_infile_1 cat < valid_infile_2
cat << < valid_infile_1
cat << << valid_infile_1
cat <<<< valid_infile_1
cat < forbidden_file < valid_infile_1
cat < valid_infile_1 < forbidden_file
cat < forbidden_file | cat < valid_infile_1
cat < valid_infile_1 | cat < forbidden_file
#outfile-trunc
> outfile1; echo $?
> forbidden_file; echo $?
echo hello world >
echo hello world > outfile1
echo abcdefghijk >outfile1
echo hello world> outfile1
> outfile1 echo abcdefghijk
>outfile1 echo hello world
echo hello world > forbidden_file
> outfile1 echo hi | echo bye
echo ab | echo cde > outfile1
cat valid_infile_1 > outfile1
cat valid_infile_1 | wc -l > outfile1
cat valid_infile_1 | grep dream | sed s/e/../g | sed s/d/X/g > outfile1
echo abcdefghijk > outfile1 > outfile2
echo hello world > outfile1 > outfile1
echo hello world > outfile1 > outfile1 > outfile1 > outfile1 > outfile1 > outfile1
echo hello world > outfile1 > outfile1 > outfile1 > outfile1 > outfile1 > outfile2
echo abcdefghijk > forbidden_file > outfile1 > outfile2
echo abcdefghijk > outfile1 > forbidden_file > outfile2
echo abcdefghijk > outfile1 > outfile2 > forbidden_file
echo > outfile1 a b c d e
echo a > outfile1 b c d e
echo a b > outfile1 c d e
echo a b c > outfile1 d e
echo a b c d > outfile1 e
echo a b c d e > outfile1
echo > outfile1 a b c d e > outfile2
echo a > outfile1 b c d e > outfile2
echo a b > outfile1 c d e > outfile2
echo a b c > outfile1 d e > outfile2
echo a b c d > outfile1 e > outfile2
echo a b c d e > outfile1 > outfile2
echo hello > outfile1 | echo world > outfile1
echo 01234 > outfile1 | echo 56789 > outfile2
echo hello > outfile1 | echo world > forbidden_file
echo 01234 > forbidden_file | echo 56789 > outfile1
#outfile-append
>> outfile1; echo $?
>> forbidden_file; echo $?
echo hello world >>
echo hello world >> outfile1
echo abcdefghijk >>outfile1
echo hello world>> outfile1
>> outfile1 echo abcdefghijk
>>outfile1 echo hello world
echo hello world >> forbidden_file
>> outfile1 echo hi | echo bye
echo ab | echo cde >> outfile1
cat valid_infile_1 >> outfile1
cat valid_infile_1 | wc -l >> outfile1
cat valid_infile_1 | grep dream | sed s/e/../g | sed s/d/X/g >> outfile1
echo abcdefghijk >> outfile1 >> outfile2
echo hello world >> outfile1 >> outfile1
echo hello world >> outfile1 >> outfile1 >> outfile1 >> outfile1 >> outfile1 >> outfile1
echo hello world >> outfile1 >> outfile1 >> outfile1 >> outfile1 >> outfile1 >> outfile2
echo abcdefghijk >> forbidden_file >> outfile1 >> outfile2
echo abcdefghijk >> outfile1 >> forbidden_file >> outfile2
echo abcdefghijk >> outfile1 >> outfile2 >> forbidden_file
echo >> outfile1 a b c d e
echo a >> outfile1 b c d e
echo a b >> outfile1 c d e
echo a b c >> outfile1 d e
echo a b c d >> outfile1 e
echo a b c d e >> outfile1
echo >> outfile1 a b c d e >> outfile2
echo a >> outfile1 b c d e >> outfile2
echo a b >> outfile1 c d e >> outfile2
echo a b c >> outfile1 d e >> outfile2
echo a b c d >> outfile1 e >> outfile2
echo a b c d e >> outfile1 >> outfile2
echo hello >> outfile1 | echo world >> outfile1
echo 01234 >> outfile1 | echo 56789 >> outfile2
echo hello >> outfile1 | echo world >> forbidden_file
echo 01234 >> forbidden_file | echo 56789 >> outfile1
#infile-outfile
< >> >
< > >>
> < >>
> >> <
>> > <
>> < >
echo hello > outfile1
cat < outfile1 >
cat < outfile1 >>
cat < > outfile1
cat < >> outfile1
cat > >> outfile1
cat >> > outfile1
< outfile1 cat > outfile1
< outfile1 cat >> outfile1
cat > outfile1 < outfile1
cat >> outfile1 < outfile1
cat < outfile1 > outfile1
cat < outfile1 >> outfile1
echo ABC > outfile1 | echo DEF >> outfile2
echo GHI >> outfile1 | echo KLM > outfile2
echo OPQ > outfile1 >> outfile2
echo RST >> outfile1 > outfile2
< valid_infile_1 cat | echo UVW > outfile1 | echo XYZ >> outfile2
< valid_infile_1 cat > outfile1 | echo ABC >> outfile1 | echo DEF > outfile2
< valid_infile_1 < valid_infile_2 cat > outfile1 >> outfile2
< valid_infile_1 < valid_infile_2 cat >> outfile1 > outfile2
< forbidden_file < valid_infile_2 cat > outfile1 >> outfile2
< valid_infile_1 < forbidden_file cat > outfile1 >> outfile2
< valid_infile_1 < valid_infile_2 cat > forbidden_file >> outfile1
< valid_infile_2 < valid_infile_1 cat > outfile1 >> forbidden_file
< valid_infile_1 < valid_infile_2 cat >> forbidden_file > outfile1
< valid_infile_2 < valid_infile_1 cat >> outfile1 > forbidden_file
< forbidden_file cat > forbidden_file >> forbidden_file
< forbidden_file cat >> forbidden_file > forbidden_file
cat >> forbidden_file > forbidden_file < forbidden_file
< valid_infile_1 cat | grep dream > forbidden_file
< valid_infile_2 cat | grep dream >> forbidden_file
< valid_infile_1 cat >> forbidden_file | wc -l > outfile1
< valid_infile_2 cat > forbidden_file | wc -l >> outfile1
< valid_infile_1 cat >> outfile1 | wc -l > forbidden_file
< valid_infile_2 cat > outfile1 | wc -l >> forbidden_file
#exit-status
echo $?
echo; echo $?
$?
$? + $?
$?; echo $?
fakecmd; echo $?
cat < file_does_not_exist; echo $?
cat < forbidden_file; echo $?
./forbidden_file; echo $?
cd existing_dir; echo $?
cd forbidden_dir; echo $?
cd dir_does_not_exist; echo $?
cd file_does_not_exist; echo $?
cd valid_infile_1; echo $?
ls dir_does_not_exist; echo $?