May 2007
Beginner
628 pages
15h 46m
English
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Sending Both Output and Error Messages to Different Files
Problem
You are expecting output from a program but you don’t want it to get littered with error messages. You’d like to save your error messages, but it’s harder to find them mixed among the expected output.
Solution
Redirect output and error messages to different files.
$ myprogram 1> messages.out 2> message.err
Or more commonly:
$ myprogram > messages.out 2> message.err
Discussion
This example shows two different output files that will be created by the shell. The first, messages.out, will get all the output from the hypothetical myprogram redirected into it. Any error messages from myprogram will be redirected into message.err.
In the constructs 1> and
2> the number is the file
descriptor, so 1 is STDOUT and 2 is STDERR. When no number is specified,
STDOUT is assumed.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.