3377

what command to use switch back and forth with files in VI editor

:bp and :bn

what symbol indicates file is empty in vi editor

~

to go to start of a file and to go to bottom of a file use what commands

G and gg

Insert before char which command

i

Insert after char which command

a

Switch from command to input in VI. You have to use what command

a,i,o

Switch from input to command. You have to use what command

Esc

How to move to line 89

:89

what can we do to recover a file

vi -r filename

how to globally replace one word with another

:%s/.../.../g

Steps to copy a test

ma
y'a
p

y'a

p

Steps to move a text

ma
d'a
p

d'a

p

Name the two modes in the vi tutor

command and insert mode

Count the files that you own in all your directories (where your userid is myusername)

ls -lR | grep myusername | wc -l

What UNIX command is used to update the modification time of a file and/or change the file's access?

touch

To list the permissions on files, which of the following commands will work?

ls -l

When you use the ln command, which of the following occurs?

a file is created that points to an existing file

(T/F)The command "grep -i hello" prints all the lines in file, not containing the string "hello".

false

Which of the following is not a UNIX file type?

plain file

special file

batch file

Which of the following is not a UNIX file type?

plain file
special file
batch file
directory file

batch file

How do you rename file "new" to be "old"?

mv new old

To delete a file called mynotes.txt, which command do you use?

rm -i mynotes.txt

In Unix, if you wanted to allow a user to list the contents of a directory, you would give the directory what permission, at least?

read

What is the generic syntax for all UNIX commands?

command name, followed by options, followed by arguments

Which command is used to create the directory "abc" in the previous (parent) directory?

mkdir ../abc

Make a copy of file "upper" in the directory two levels up.

cp upper ../..

Consider a file abc which can be "read, write, execute" only by the owner. After the following command: "chmod g+x abc", the result will be is equivalent to the result of command:

chmod 710 abc.

(T/F)The command "grep hello file" prints all lines in "file" that contains hello.

true

What is a shell in UNIX?

a program through which users can issue commands to UNIX

How do you print the first 15 lines of all files ending by ".txt"?

head -15 *.txt

To create a new file "new.txt" that is a concatenation of "file1.txt" and "file2.txt" is done by which command?

cat file1.txt file2.txt > new.txt

To match all your .files (that is, any hidden files begins with a period).

ls .*

Use this as a last resort to destroy any jobs or programs that you suspended and are unable to restart

kill

This displays information about programs that are currently running

Displays process status

ps

Sorts and/or merges files

sort

This displays the beginning of a file

head

This joins lines from two files based on a common field

join

With this option of chmod command,

Owner can read, write, and execute the file; group and other can execute the file.

0711

Displays the last part (tail) of a file

tail

outputs content of a text file, read through brief files, concatenate files together

cat

This displays text files, one screen at a time

less

This reports file system disk usage (i.e., the amount of space taken up on mounted file systems).

df

This searches for a pattern in files

grep

Owner can read, and write the file; group can read the file, and other cannot access the file.

0640

To run a program or command in background, use this symbol at the end of the command line.

Ampersand ("&")

Pipe ("|")

Percent ("%")

Dollar ("$")

To run a program or command in background, use this symbol at the end of the command line.
Ampersand ("&")
Pipe ("|")
Percent ("%")
Dollar ("$")
At-sign ("@")

Ampersand ("&")

This terminates a process by PID

kill

terminate

pskill

stop

This terminates a process by PID

kill
terminate
pskill
stop
procterm

kill

Which one of the following methods is NOT correct for two processes to communicate each other?

pipe

What is the acronym for the unique id given to each running process

PID

All directories are in a _________ structure

hierarchical

What is the symbol for root directory

/

/bin

Holds the files needed to bring the system up and run it when it first comes up in single-user/recovery mode.

/dev

Device files Contains all the files that represent peripheral devices, such as disk drives, terminals, and printers.

/boot

Static files of the boot loader Contains all the files needed to boot the system.

/opt

Add-on (optional) software packages

/sbin

Essential system binaries and used only by superuser

Special user for administrator is called

superuser

change directory

cd

pwd

show current position/working direcotry

what command can we use to navigate one up in the directory hierarchy?

cd ..

List all files/folders that end in ".bashrc"

ls -l .bashrc

hidden filenames start with

.

switch user command

su

change password

passwd

list all

ls -a

detailed list of all files and directories

ls -la

The command searches for the string "Desk" in the redirect.txt file and for each line that contains "Desk", it prints the line number.

grep -n Desk redirect.txt

It shows the last 10 lines of a file and filters them to display only lines containing the word "Desk."

It shows the last 10 lines of a file and filters them to display only lines containing the word "Desk."
What command is this?

tail redirect.txt | grep Desk

identify the largest file in the directory

ls -la/bin | sort -nk5 | tail -1

lists all running processes and then filters the list to show only the processes that have "Java" in their command or arguments

ps -ef | grep Java

Does it compile, link or both : g++ -o textr *.cpp

Both compilation and linking.

Does it compile, link or both : g++ -Wall -g -c main.cpp

Compilation only.

Does it compile, link or both : g++ -o myProg -L/usr/class/cs193/danLib -lDansFns *.o

Linking only.

Does it compile, link or both : g++ -I/usr/class/cs193/inc main.cpp src1.cpp src2.cpp

Both compilation and linking.