bash - Shell redirection i/o order -

i'm playing i/o shell redirection. commands i've tried (in bash):

ls -al *.xyz 2>&1 1> files.lst 

and

ls -al *.xyz 1> files.lst 2>&1 

there no *.xyz file in current folder.

these commands gives me different results. first command shows error message ls: *.xyz: no such file or directory on screen. second 1 prints error message file. why did first command failed write err output file?

this error:

ls: *.xyz: no such file or directory 

is being written on stderr ls binary.

however in command:

ls -al *.xyz 2>&1 1> files.lst 

you're first redirecting stderr stdout default goes tty (terminal)

and you're redirecting stdout file files.lst, remember stderr doesn't redirected file since have stderr stdout redirection before stdout file redirection. stderr still gets written tty in case.

however in 2nd case change order of redirections (first stdout file , stderr stdout) , rightly redirects stderr file being used stdout.