ls ( -B option ) ( not complete )

UNIX Command

$ls
a1.txt	a2.txt
$ls .
./  ../
$cp a1.txt a1.txt~
$ls
a1.txt	a1.txt~  a2.txt
$ls -B
a1.txt	a2.txt
$l
bash: l: command not found
$ls
a1.txt	a1.txt~  a2.txt
$ls --backup
ls: unrecognized option '--backup'
Try `ls --help' for more information.
$ls --ignore-backups
a1.txt	a2.txt
$

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