Create a text file named usedShells. txt that contains only the login$-$names and the default Shells used by all users in the file passwd

Write the command that applies the file permissions $rwx,rw-,$ rw$-$to the file usedShells.txt$.$

$($a$)$ Write the commands that generated the outputs below. $($b$)$ What is the difference between the outputs for commands $1.$ And $2.($a$)1\mathrm{.}2\mathrm{.}3.($b$)$