A and C

To number all first 10 lines

To number all nonprintable text file lines

To number all text file lines

DNS

Netatalk

Samba

NFS

Nothing, it has no special meaning

Any two single characters

A user’s home directory

The directory above the current working directory

wc -ir /etc/nsswitch.conf

wc -L /etc/nsswitch.conf

wc -N /etc/nsswitch.conf

wc -i /etc/nsswitch.conf

sudo

what

which

where

Default libraries that control text file permissions

A and C

One or more characters that create a boundary between different data items within a record

Characters that are created by system default configurations and run on /etc/passwd

KornShell

Dash

All answers are correct

Bash

-help

-info

-ls

-doc

readlink /bin/sh

readlink /bin/bash

readlink /home/sh

readlink /etc/sh

It works across Linux/Mac/Windows

It still supports old file formats or applications

If the next version still works the same way

It can be upgraded without downtime