What is the difference between pipe and filter?

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# 1  
Old 10-24-2001
What is the difference between pipe and filter?


I am bit confuse, you see i'm not to sure about the concept of pipe as used by Unix.

How is pipe different from a filter?
How is pipe different from a file redirection?

# 2  
Old 10-24-2001
A pipe (or "|") is used to redirect output to another command.
For example,

ls -la | more

Will pipe output to the more command letting view the directory listing one page at a time.

A redirector (">" or ">>" or "<" or "<<" normally tells where to output or take input from another file.

ls -la > filename

This will write the output of the ls command to a file called "filename".
# 3  
Old 10-24-2001
there is some good explanation here

# 4  
Old 10-24-2001
It now makes a bit more sense.

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