Linux 10-18

type multiple commands at one prompt.

send the output of a command to a file.

send the same input to multiple commands.

send the output of one command to another.

STDALL

STDOUT

STDERR

STDIN

will display all the lines in a file containing the specified Regular Expression.

will display the line numbers in a file that contain a specified Regular Expression.

is not case sensitive.

will display all the lines that begin with the specified Regular Expression.

less

cat

more

some

nl

ln

sort

num

Firefox

nano

/bin/bash

vi

LibreOffice Writer

for loops operate over a fixed list of items

while loops operate over a fixed list of items

while loops have a test each cycle to determine if it should run again

for loops have a test each cycle to determine if it should run again

for loops require a variable over which to iterate

$A=”Hello”

echo “Hello” > A

echo $A “Hello”

A = “Hello”

A=”Hello”

pwd $A

A=`pwd`

A=cwd

pwd | $A

A=pwd

This runs the command stored in variable i

If i is 0, the loop will stop

This will return the value of the next argument to the script

1 will be added to the i variable

This will return the value of the first argument to the script

24-bit

32-bit

64-bit

48-bit

Virtual RAM is stored on a hard drive

Virtual RAM is also called swap space

Virtual RAM is stored in the CPU

Virtual RAM is used when available physical RAM is low.

portion

block

label

partition

True

False

cpuinfo

showcpu

lspic

arch

lscpu

1

varies

100

0

/var/log

/log

/usr/log

/proc/loc

True

False

ps -ef

ps aux

ps -A

ps -eLf

ps

/

/root

/sys

/home

/var

a file that contains configuration information

another name for a computer’s hostname

…like an IP address.

…a feature provided by one computer to another.

True

False

192.301.25.25

10.33.55.77

192.105.10.10

192.105.10.10.2

ssh

route

netstat

dig

/etc/passwords

/etc/shadow

/etc/passwd

/etc/group

id

who

about

whoami

True

False

groups -a

all

id root

all -t

group -r

System accounts, such as server processes

Are not used for user accounts, but for group accounts

Log-in (human) users

Remote log-in accounts

id

whoami

about

who

-u

-g

-M

-G

shell

history

last

login

/etc/shadow

/etc/group

/etc/passwd

/etc/usr

-G

-U

-g

-u

usermod

useradd

adduser

moduser

primary

octal

symbolic

letter

True

False

The file owner

Only root

A user that belongs to the files current group

The file owner and root

True

False

…changes the group ownership of existing files in a directory.

…prevents others from overwriting files they don’t own in common directories.

…sets the group ownership of any new file created in a directory.

…prevents others from removing files they don’t own from a common directory.

…reports the output of a script to the owner.

…allows files in a directory to be manipulated as by the directory owner.

…allows a command to be run as the file owner.

…prevents the owner of a file from being changed.

…prevents the group owner of a file from being changed.

…can only be set on files.

…allows files created in a directory to be owned by the group that owns the directory.

…allows a command to be run as the group owner of the file.

ls -h

ls -d

ls -ld

ld -a