tac

cat

tail -f

head

ls -d

ls -l | grep "$d"

ls -l | grep "^d"

ls -ltr | grep -d

tee

> (Redirection operator)

Redirection operator (>) and Standard Ouput ($1)

All

du | sort -r | head -5

du | sort -nr | head -5

du | sort -n | head -5

du

$$

$

Process ID of the current session.

Process ID of the parent session

df

du

1 and 2

None

ls -ltr *.zip

ls -ltr | grep "zip$"

1 and 2

None

echo "Today is date +%y%m%d"

1 and 2

echo Today is date +%y%m%d

None

ps -ef | grep argon

ps -ef | grep "argon"

1 and 2

None

ps

kill PID

kill ps

kill -9 "PID"

022

032

644

000

cat /proc/meminfo

vmstat

vmstat -f

ls

ls

ls -s

ls -a

ls -a .*

ifconfig

netstat -r

ping

none

netstat

netstat -s

netstat -t

all the above

3

1

11

0

True

False

True

False

True

False

ISDN

Modem

DSL

HDSL