Redirect debug and STDOUT to different files

Question

Is there a way to redirect my debug output to a file and normal STDOUT on screen.

$ cat test1.sh
#!/bin/bash

echo HAI
echo BYE

$ sh -x test1.sh
+ echo HAI
HAI
+ echo BYE
BYE

I want to redirect the debug output to file and normal output on the screen.

$ sh -x test1.sh >file1
+ echo HAI
+ echo BYE

But I can redirect the output to a file and ending the debug output on screen.

debug output from `-x` goes to stderr. You can redirect stderr to a file as shown by @Tichodroma — hek2mgl, Oct 06 '13 at 12:13
What if your script writes to stderr and would like to separate debug output from the output of the script? — pihentagy, May 05 '15 at 14:12

score 3 · Answer 1 · edited May 23 '17 at 11:46

3

Use 2>:

$ sh -x test1.sh 2> /dev/null
HAI
BYE

edited May 23 '17 at 11:46

Community

answered Oct 06 '13 at 12:11

score 2 · Answer 2 · answered Oct 06 '13 at 12:31

2

Default file descriptors on linux system are:

stdin - 0
stdout - 1
stderr - 2

to redirect to file,

sh test1.sh 1> file

to redirect error(stderr) to console(stdout)

sh test1.sh 2>&1

answered Oct 06 '13 at 12:31

user1502952

score 0 · Accepted Answer · answered Oct 06 '13 at 12:31

0

I used alias to give the complete command and using the following way

$ alias mytest='sh -x test1.sh 2>out.test'
$ mytest
HAI
BYE
$ cat out.test
+ echo HAI
+ echo BYE

Thanks every one..

answered Oct 06 '13 at 12:31

Sriharsha Kalluru

Did any of the answers help you so you can accept it? How about upvoting helpful answers? – Oct 06 '13 at 12:35

3 Answers3