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Old 10-18-2018, 08:09 AM   #1
chaotik
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Registered: Jul 2018
Posts: 1

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Question redirecting stdout and stderr output


Can someone explain what is happening here?

I do not understand why both stderr and stdout are not redirected to the same file. (sample1 and sample2 files exist, and there is no sample3 file)

root@dell:~# ls -l sample1 sample2 sample3 >&2 2>file2
-rw-r--r-- 1 root root 0 Oct 17 12:11 sample1
-rw-r--r-- 1 root root 0 Oct 17 12:11 sample2

root@dell:~# cat file2
ls: cannot access 'sample3': No such file or directory


Thank you.

Last edited by chaotik; 10-18-2018 at 08:13 AM.
 
Old 10-18-2018, 08:43 AM   #2
l0f4r0
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Registered: Jul 2018
Location: Paris
Distribution: Debian
Posts: 852

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Order is important regarding redirections. You cannot redirect a flow to somewhere undefined previously (in your case you are telling: redirect standard output to where error output is redirected, but you define the error output redirection only after)
Instead, please try:
Code:
ls -l sample1 sample2 sample3 >file2 2>&1
or
Code:
ls -l sample1 sample2 sample3 2>file2 >&2
or
Code:
ls -l sample1 sample2 sample3 &>file2

Last edited by l0f4r0; 10-18-2018 at 08:48 AM.
 
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