Linux terminal output redirection

Question

I want to redirect the output of a bash script to a file.

The script is:

#!/bin/bash
echo "recursive c"
for ((i=0;i<=20;i+=1)); do
time ./recursive
done

But if I run it like this:

script.sh >> temp.txt

only the output of ./recursive will be captured in the file.

I want to capture the output of time command in the file.

Jon Ericson · Accepted Answer · 2009-02-26 00:22:18Z

8

Redirect STDERR to STDOUT:

script.sh >> temp.txt  2>&1

Or if using bash 4.0:

$ script.sh &>> temp.txt

(Thanks for the second form go to commenter ephemient. I can't verify as I have an earlier bash.)

My tests were surprising:

$ time sleep 1 > /dev/null 2>&1

real    0m1.036s
user    0m0.002s
sys     0m0.032s

The problem is the redirection was included as part of the command to be timed. Here was the solution for this test:

$ (time sleep 1) > /dev/null 2>&1

I don't think this is part of your problem, but it seemed worth a mention.

answered Feb 25, 2009 at 22:14

Jon Ericson

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1 Comment

New in bash 4.0: script.sh &>> temp.txt does the same as above. :)

CenterOrbit · Accepted Answer · 2011-03-16 18:24:13Z

2

I prefer the &>> method better, but this is a solution as well:

$ script.sh 2>&1 |tee -a temp.txt

answered Mar 16, 2011 at 18:24

CenterOrbit

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Yep, me too. You can view the output in console and have it in the file too.