CSCI1302 Unix Commands Masterlist and More

ssh user@hostname

Start a secure shell connection to [hostname] and login as [user]

pwd

Print absolute path of current working directory

date

Print system date and time

exit

Exit current shell

whoami

Print user name associated with current user

ls

List contents of current working directory

ls PATH

List contents of last directory in path; can be absolute or relative

tree PATH

List contents of last directory in path in tree format; can be absolute or relative

ls -l

[ls] uses long listing format

ls -l -h

[ls] uses long listing format with human-readable size units

cd

home directory

cd -

Goes to last directory you worked in

cd a/b/dest

Goes to [dest]; relative path

cd /a/b/dest

Goes to [dest]; absolute path

cd ~/a/b/dest

Goes to [dest]; absolute path

ls -a

[ls] shows hidden files that start with [.]

ls .

[ls] shows contents of [.] (current directory)

ls ..

[ls] shows contents of [..] (parent directory)

cd .

Goes to [.] (current directory)

cd ../..

Goes to [../..] (parent of parent directory)

C-a

Move to beginning of line

C-e

Move to end of line

C-f

Move forward 1 char

M-f

Move forward 1 word

C-b

Move backward 1 char

M-b

Move backward 1 word

cat fileName

Display contents of regular file all at once to standard output (terminal screen)

less fileName

Display contents of regular file 1 page at a time

mkdir dirName

Create directory called [dirName]

mkdir -p PATH

Passively creates directories in path if they do not exist

mv SOURCE DEST

Rename file [SOURCE] to [DEST]

mv SOURCE...DIRECTORY

Move [SOURCE(s)] to [DIRECTORY]

cp SOURCE DEST

Copy [SOURCE] to [DEST]

cp SOURCE...DIRECTORY

Copy [SOURCE(s)] to [DIRECTORY]

cp -r SOURCE DEST

Copy [SOURCE] and its contents to [DEST]

rm PATH

Remove/delete file (cannot remove directory)

rm -r DIRECTORY

Remove/delete directory and contents

touch notes.txt

Creates an empty file called [notes.txt]

emacs PATH

Open file in Emacs

cat...C-d

Displays content from standard input (keyboard)

cat > list1

Redirects output to a file called [list1]

cat >> list1

Appends more inputs to [list1]

cat list1 list2 > biglist

Reads input from [list1] and [list2] and redirects output from both into [biglist]

sort

Like cat but output will be sorted

who

Sees who is on the system with you

ls -lag

List access rights for all files

chmod [options] file

Change access rights for named file

ps

List current processes

sleep [# of seconds]

Waits [# of seconds] before calling next command

&

Runs command in background

bg

Runs suspended job in background

jobs

List current jobs

fg %jobnumber

Restarts suspended process

^C

Kills job running in foreground

kill %jobnumber

Kills suspended/background processes

sort < biglist

Gets input from [biglist] and sorts it

who | sort

Takes input from [who] and sorts it; | connects input and command

javac -d bin src/Code.java

Compiles [Code.java] and puts it in [bin]

java -cp bin Code

Runs [Code], specifying that it is in [bin]; can be used anywhere

-cp some/path

Specifies the classpath (where it is); can be used by both [java] and [javac]

-cp path1:path2

Used to specify multiple paths

try { //regular code } catch { // code to handle exception}

Can place code into [try] block where exceptions are dealt with in [catch] block

throw new [exception] ( [message] );

Create exception and explicitly throw it

throws

In method signature; tells Java that exception won't be handled in this method

javadoc -d doc -sourcepath src -subpackages cs1302

Javadoc creates HTML files for API documentation website

What does -d, -sourcepath, and -subpackages mean in the following command?

javadoc -d doc -sourcepath src -subpackages cs1302

-d = specifies where generated HTML files will go

-sourcepath = shows where source code is

-subpackages = shows which subpackages to go to

ln -s $(pwd)/doc

Shortcut for creating symbolic link

public interface Styleable {}

Declares interface named [Styleable]

public void style();

Abstract method style(); no {}

public class Fancy implements Styleable {}

[Fancy] class implementing interface named [Styleable]

Styleable s = new Fancy("new message");

Declaring variable [s] with [Styleable] type; creating [Fancy] object

Given that Styleable is an interface, is the following valid or unvalid?

Styleable s = new Styleable("new message");

Unvalid b/c you can't create objects with interfaces (they are made up of abstract methods)

What are UML class diagrams made of?

Class name, attributes, and operations

How do you signify private, public, and static in UML diagrams?

- = private

+ = public

underline = static

Format for attributes (UML diagrams)

visibility name : type

Format for operations (UML diagrams)

visibility [<>] methodName(param1: type, param2: type): returnType

Regular arrow (UML diagram)

[Class A] uses [Class B]

Unfilled arrowhead (UML diagram)

[Child] extends [Parent]

Dashed line, unfilled arrowhead (UML diagram)

[SomeClass] implements [SomeInterface]

#! [interpreter] [optional-arg]

First line of interpreter script text file

How to execute interpreter script?

Type the path to interpreter script text file to execute it

#!/bin/bash -x

[-x] prints out command and command execution

#!/bin/bash -e

[-e] stops executing commands if one of them terminates with error