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% "
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% |
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% ^
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% |   |
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% ^   ^
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% | cat
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% ^ cat
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% echo Hello! |
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% echo Hello! ^
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% echo Hello! | cat |
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% echo Hello! ^ cat ^
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% echo Hello! |   | grep H
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% echo Hello! ^   ^ grep H
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% ||
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% ^^
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% |cat
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% ^cat
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% echo Hello!|
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% echo Hello!^
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% echo Hello!|cat|
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% echo Hello!^cat^
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% echo Hello!||grep H
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% echo Hello!^^grep H
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% (
syntax error
% ( echo Hello!
syntax error
% ( ( echo Hello! )
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% ( ( echo Hello! ); echo Hello again!
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% echo Hello! | ( ( cat ) | grep H
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% ( echo Hello! | ( ( cat ) | grep H )
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% echo Hello! ^ ( ( cat ) ^ grep H
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% ( echo Hello! ^ ( ( cat ) ^ grep H )
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% )
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% echo Hello! )
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% ( echo Hello! ) )
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% ( echo Hello! ); echo Hello again! )
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% echo Hello! | ( cat ) ) | grep H
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% ( echo Hello! | ( cat ) ) | grep H )
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% echo Hello! ^ ( cat ) ) ^ grep H
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% ( echo Hello! ^ ( cat ) ) ^ grep H )
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% (   )
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% ( (   ) )
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% ( ( (   ) ) )
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% ( echo Hello! ) | (   ) | ( grep H )
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% ( ( echo Hello! ) | (   ) | ( grep H ) )
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% ()
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% (())
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% ((()))
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% (echo Hello!)|()|(grep H)
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% ((echo Hello!)|()|(grep H))
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% :( echo Hello! )
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% echo ( Hello! )
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% : nothing </dev/null ( cat )
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% </dev/null : nothing ( cat )
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% ( echo Hello! ):
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% ( echo ) Hello!
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% ( echo Hello! ) >/dev/null : nothing
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% ( echo Hello! ) : nothing >/dev/null
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% <
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% >
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% >>
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% <>
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% ><
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% <>>
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% >><
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% cat < >/dev/null
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% cat > </dev/null
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% cat </dev/null >
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% cat >/dev/null <
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% </dev/nullcat
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% </dev/null"cat"
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% </dev/null
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% </dev/null >/dev/null
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% >/dev/null
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% >/dev/null </dev/null
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% >>/dev/null
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% >>/dev/null </dev/null
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% </dev/null ( | )
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% >/dev/null ( | )
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% ( | ) </dev/null
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% ( | ) >/dev/null
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% </dev/null >/dev/null ( | )
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% >/dev/null </dev/null ( | )
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% </dev/null ( | ) >/dev/null
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% >/dev/null ( | ) </dev/null
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% ( | ) </dev/null >/dev/null
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% ( | ) >/dev/null </dev/null
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% </dev/null ( < )
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% >/dev/null ( < )
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% ( < ) </dev/null
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% ( < ) >/dev/null
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% </dev/null >/dev/null ( < )
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% >/dev/null </dev/null ( < )
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% </dev/null ( < ) >/dev/null
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% >/dev/null ( < ) </dev/null
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% ( < ) </dev/null >/dev/null
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% ( < ) >/dev/null </dev/null
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% echo "\""
syntax error
% echo '\''
syntax error
% echo "\"Hello World! =)\""
syntax error
% echo '\'Hello World! =)\''
syntax error
End .