[Linux] >, >>, <, | 간단한 예제

용어

Redirection

output :  > (Overwrite), >> (append)

input : <

pipeline : |

 

예제

echo 'hi' > test.txt
cat test.txt
# hi

echo 'hello' > test.txt
cat test.txxt
# hello

echo 'hi' >> test.txt	# append
cat test.txt
# hello
# hi

cat < test.txt	# input
# hello
# hi

grep hel test.txt
# hello

grep hel < test.txt # input
# hello

cat test.txt | grep hel	# pipline
# hello

cat test.txt | grep hel > test2.txt # pipeline & redirection
cat test2.txt
# hello