Quiz 3

nice

Changes the priority of a command

renice

Changes the priority of a process

test

Check file types and compare values

xargs

Converts standard input to command lines

tee

Copies standard input to standard output and one or more files

mkdir

Creates a directory

touch

Creates a file or changes a file's access and/or modification time

mkfs

Creates a filesystem on a device

sleep

Creates a process that sleeps for a specified interval

pax

Creates an archive, restores files from an archive, or copies a directory hierarchy

man

Displays documentation for utilities

stat

Displays information about files

w

Displays information about local system users

who

Displays information about logged-in users

ls

Displays information about one or more files

stty

Displays or sets terminal parameters

ps

Displays process status

strings

Displays strings of printable characters from files

tail

Displays the last part (tail) of a file

wc

Displays the number of lines, words, and bytes in one or more files

uniq

Displays unique lines from a file

split

Divides a file into sections

od

Dumps the contents of a file

top

Dynamically displays process status

sed

Edits a file noninteractively

df

For each mounted file system, This reports the file system device, the number of blocks, the number of blocks available, and the directory where the file system is mounted.

w

If you use This , you also get a list of what they are doing.

who

If you use This , you also get the IP numbers or computer names of the terminals they are using.

paste

Joins corresponding lines from files

make

Keeps a set of programs current (to compile, link edit, clean, etc).

nl

Numbers lines from a file

0010

Only Group can execute the file

0040

Only Group can read the file

0020

Only Group can write the file

0001

Only Others can execute the file

0004

Only Others can read the file

0002

Only Others can write the file

0100

Only Owner can execute the file

0400

Only Owner can read the file

0200

Only Owner can write to the file

open

Opens files, directories, and URLs

rm

Removes a file (deletes a link)

rmdir

Removes directories

mv

Renames or moves a file

tr

Replaces specified characters

nohup

Runs a command that keeps running after you log out

rsync

Securely copies files and directory hierarchies over a network

scp

Securely copies one or more files to or from a remote system

ssh

Securely runs a program or opens a shell on a remote system

2000

Sets the group ID when the program is executed

which

Shows where in PATH a utility is located

sort

Sorts and/or merges files

umask

Specifies the file-creation permissions mask

1000

Sticky Bit

tar

Stores or retrieves files to/from an archive file

gzip, gunzip, zcat

The ___ utility compresses files, the ___ utility restores files compressed with gzip, and the ___ utility displays files compressed with this utility.

expr

This (utility) evaluates an expression and sends the result to standard output.

gcc

This ___ will compile C and C++ programs

chmod

This changes the permission information associated with a file.

cd

This changes your current directory location.

comm

This compares sorted files

configure

This configures the source code automatically.

cp

This copies a file, preserving the original and creating an identical copy.

cpio

This creates an archive, restores files from an archive, or copies a directory hierarchy.

ps

This displays information about programs (i.e., processes) that are currently running.

set

This displays or changes various settings and options associated with your Unix session.

less

This displays text files, one screen at a time

head

This displays the beginning of a file

file

This displays the classification of a file

more

This displays the contents of a file one screen at a time, waiting for you to press the Spacebar between screens.

date

This displays the current day, date, time, and year.

cmp

This displays the differences between two files on a byte-by-byte basis.

find

This is most commonly used to find all of the files that have a certain name.

join

This joins lines from two files based on a common field

less

This lets you read text without it scrolling quickly off your screen.

ls

This lists all of the files within a directory and its subdirectories that match a set of conditions.

w

This lists all users logged into the computer.

ln

This makes a link to a file

cat

This outputs the contents of a text file. You can use it to read brief files or to concatenate files together.

jobs

This reports any programs that you suspended and still have running or waiting in the background (if you had pressed Ctrl-z to suspend an editing session, for example).

du

This reports disk usage (i.e., the amount of space taken up by a group of files).

df

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

grep

This searches for a pattern in files

cut

This selects characters or fields from input lines and writes them to standard output.

lpr

This sends files to printers

kill

This terminates a process by PID

finger

This utility displays the usernames of users, together with their full names, terminal device numbers, times they logged in, and other information.

fsck

This utility verifies the integrity of a filesystem and reports on and optionally repairs problems it finds.

ls

This will list the files and the subdirectories in a directory.

mkdir

This will make a new subdirectory.

mv

This will move a file.

cal

This will print a calendar for a specified month and/or year.

rm

This will remove (delete) a file.

rmdir

This will remove (delete) a subdirectory.

ls -l | cut -c2-10

To output only the permissions of the files in the working directory, which of the following commands will do it?

kill

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

-a

With ls command, use this option to list all the "dot" files (configuration files that begin with a period, such as .login or .profile).

0777

With this option of chmod command, Owner, group, and others can read, write, and execute the file.

0644

With this option of chmod command, Owner can read, and write the file; group and other can read the file.

0640

With this option of chmod command, Owner can read, and write the file; group can read the file, and other cannot access the file.

0711

With this option of chmod command, Owner can read, write, and execute the file; group and other can execute the file.

0755

With this option of chmod command, Owner can read, write, and execute the file; group and other can read and execute the file.

X

[chmod] Make the file executable only if it is a directory

s

[chmod] Set the user ID or group ID of the file while the file is being executed

x

[chmod] Sets execute permission

r

[chmod] Sets read permission

o

[chmod] Sets the specified permissions to those of others

g

[chmod] Sets the specified permissions to those of the group

u

[chmod] Sets the specified permissions to those of the owner

t

[chmod] Sets the sticky bit

4000

[chmod] Sets the user ID when the program is executed

w

[chmod] Sets write permission