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test Pipe:
node n
shell on n as sh:
echo abcd | grep -o '[bc]*'
echo abcd | grep -o '[bcd]*' | grep -o '[ab]*'
test Redirect:
node n
shell on n as sh:
echo a > file
echo b > file
echo c >> file
echo x
cat file
echo y
cat < file
echo z
test PipeRedirect:
node n
shell on n as sh:
echo abcdefghi | grep -o '[b-h]*' | grep -o '[a-g]*' > file
cat < file | grep -o '[acegi]' | cat > file2
cat file2 - < file
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