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Question in reference to the pipe |

 
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# 1  
Old 10-03-2006
Tools Question in reference to the pipe |
My question is can you use the pipe more than one time in the same command line? By the way I am new to UNIX. Thanks in advanced!
# 2  
Old 10-03-2006
Each process only has one standard output, so there's only one thing per process to pipe... You could do things like redirecting standard error into fifo files, but I wouldn't reccomend using standard error to carry data for performance and reliability reasons -- it's unbuffered, and supposed to be for errors, what happens when "cannot open file" appears in the middle of your data stream?
# 3  
Old 10-03-2006
I think (although I may be wrong) that the poster is asking if it is legal to do something like
Code:
grep "foo" | sort | uniq

If that's the case, then yes, you can do that.
# 4  
Old 10-03-2006
MySQL Thank you Glen
That's what I was asking. Thanks all for the quit response. I am so Smilie that I found this forum. I can already see its going to be a great help for me to learn more about UNIX. Once again Thank you!
 
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