Problem with 2>&1

[Pradnya Kiri Taksande]

Hello there,

The below statement can be used to save all the log statements in the file log.out.
./waf --run scratch/file_name > log.out 2>&1

Is there a requirement for using this "2>&1" for saving the log statements in a file?
For instance, does it need some package or something ?
It is working on some machines and not on others.

Thanks,
Pradnya

[fordev user]

Hello,

try this :

./waf --run scratch/file_name 2> namefile.log

[Pradnya Kiri Taksande]

Hello,

Thanks for the prompt reply.
But this " /waf --run scratch/file_name 2> log.out "  did not work.

With "./waf --run scratch/file_name > log.out 2>&1" ,
the 'std::cout' statements were getting saved in log.out, but with the suggestion given by you even these statements were not
not getting saved in log file and the log file turned out to be empty.

I want all statements including 'std:cout' as well as 'NS_LOG_INFO' statements to be saved in the log file.

Thanks,
Pradnya 

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[fordev user]

Hello, 

You tried .txt?

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[Pradnya Kiri Taksande]

I tried .txt, .out and .log all three. 
None of them seem to work.

Thanks,
Pradnya

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[Pradnya Kiri Taksande]

Forgot to mention, I am using ns3.26.

Thanks,
Pradnya

[fordev user]

Ah sorry for that i'm not sure i will search for it 

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[Pradnya Kiri Taksande]

What is the basic logic for 2>&1 ?
Why this simple statement will write the logs in a file ?
Just curious.

Thanks,
Pradnya 

[fordev user]

For this statement i dont know it sorry   i'm also beginner

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[Pradnya Kiri Taksande]

Hello there,

Is it OS dependent ?
In machine with ubuntu 16.04 it is working, but not on machines with older versions of ubuntu.

Thanks,
Pradnya

[Pradnya Kiri Taksande]

Hello,

I re-installed ns3.26 with "--enable-examples --enable-tests" and it worked  :)

Thanks,
Pradnya

[fordev user]

it was problem version?

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[Craig Dowell]

Google is your friend.  The first thing it finds for 2>&1 is:

https://www.brianstorti.com/understanding-shell-script-idiom-redirect/

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[Pradnya Kiri Taksande]

I think "--enable-examples --enable-tests" while installing solved the problem.

Thanks,
Pradnya

On Wednesday, August 28, 2019 at 7:28:10 PM UTC+5:30, fordev user wrote:

it was problem version?

Le mer. 28 août 2019 à 15:56, Pradnya Kiri Taksande <pragn...@gmail.com> a écrit :

Hello,

I re-installed ns3.26 with "--enable-examples --enable-tests" and it worked  :)

Thanks,
Pradnya

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