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How do I redirect output from "find", either to a file or another command?


 
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Top Forums UNIX for Beginners Questions & Answers How do I redirect output from "find", either to a file or another command?
# 8  
Old 02-09-2020
2&>1 creates a file named 1 in the current directory.
2>&1 is correct: it redirects descriptor 2 (stderr) to descriptor 1 (stdout). The & makes the following a file descriptor.
And the following | passes the now combined stdout to the following command as stdin.
These 2 Users Gave Thanks to MadeInGermany For This Post:
# 9  
Old 02-09-2020
Quote:
Originally Posted by MadeInGermany
2&>1 creates a file named 1 in the current directory.
2>&1 is correct: it redirects descriptor 2 (stderr) to descriptor 1 (stdout). The & makes the following a file descriptor.
And the following | passes the now combined stdout to the following command as stdin.
Oops, typo in my earlier reply - thanks MadeInGermany for picking this up.
# 10  
Old 02-10-2020
Thanks, perhaps I should have realized it was something like that. If you (MadeInGermany) would care to clarify one more thing: you say "The & makes the following a file descriptor" -- what does "file descriptor" mean in this context?
# 11  
Old 02-10-2020
There is nothing stopping you creating file descriptors and use them afterwards
like
Code:
[some program] -options -args >&6 # as I need the output to use as input for &4 that.....

# 12  
Old 02-10-2020
Well, that's interesting. I see from searching for "File Descriptor" that it refers to an integer that in turn refers to a 'file' (or a byte stream) for a process on a Unix system. I guess the only other thing I would like to know now is how to know whether the "&" is needed at a particular point on the command line. As we have it "2" indicated stderr, but "1" indicated a file named 1, and "&1" indicated stdout. How would I know when to include "&"?
# 13  
Old 02-10-2020
OK I see we could have some misunderstanding: I suggest you document yourself on special files, file descriptors, and what I mentionned above related to named pipes... In order to understand what I thrown at you ( thus know how to create them...) I suppose a little reading on what and how to use FIFOs may be far from beeing a waste of time...
# 14  
Old 02-10-2020
Looking at the thread title, we are going of topic...
So reading again #1
Quote:
I get a large number of lines saying my access is denied in various directories.
Normal if you are not root... many files are only readonly for that user
Code:
find -name "rog*.*"

should really be:
Code:
find  <the pathto where to begin your search> -name "rog*.*"

doing so if you installed ( not root) you sure will see what you are looking for
...
Code:
find -name 'rog*.*' > ~/output.txt

Should not :
Quote:
still puts the output on the screen, and creates and empty file.
What have you not said to us?
Code:
find -name "rog*.*" | grep -v denied

Sure will send to your Display, you have not redirected to a file
Remember STDOUT? yes the default is your display...
Code:
find -name "rog*.*" | grep -v denied > ~/mysearch.out

would have not displayed anything...

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