本文介绍了Linux中的管道命令，解释了管道如何帮助数据在多个程序间传递，并通过实例演示了其用法。
learning new stuff always makes you exited. and i have to write down it and increase my memory for it as well.
today i finished reading pipe commands in Linux. we just make a "|" to stand for that.
what is a pipe?
a pipe helps you transfer the data from one program to another program and to another another program and recursively, you can adjacent as many as programs you like , if it is convenient for you.
the usage of pipe is ,eg "ls | head -3 | tail -1 > output.txt".
COOL!
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