[SOLVED] redirecting stdout and stderr output

chaotik · 10-18-2018, 08:09 AM

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.

l0f4r0 · 10-18-2018, 08:43 AM

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