Command Line Crash Course Flashcards by Phil Battos

Q

What does “rm -rf /” do?

A

delete all contents of current file/app

never type this

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Q

What does ‘pwd’ mean?

What does ‘pwd’ do?

A

print working directory

- it prints path of current directory

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Q

hostname

A

my computer’s network name

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Q

mkdir

A

make directory

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Q

cd

A

change directory

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Q

ls

A

list contents of directory

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Q

rmdir

A

remove directory

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Q

pushd

A

push directory

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Q

popd

A

pop directory

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Q

cp

A

copy a file or directory

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Q

mv

A

mv [current_name] [new_name]

move (or rename) a file or directory

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Q

less

A

page through a file

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Q

cat

A

print the whole file

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Q

xargs

A

execute argument

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Q

find

A

find files

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Q

grep

A

find things inside files

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Q

man

A

read a manual page

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Q

apropos

A

find what man page is appropriate

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Q

env

Study These Flashcards

A

look at your environment

Q

echo

Study These Flashcards

A

print some arguments

Q

export

Study These Flashcards

A

export/set a new environment variable

Q

exit

Study These Flashcards

A

exit the shell

Q

sudo

Study These Flashcards

A

become super user root

DANGER! DANGER!

Q

chmod

Study These Flashcards

A

change permission modifiers

chown

change ownership

What is bash?

* command line?

alternate name for "directory"?

folder

alternate name for "folder"?

directory

Unix or Windows command prompt: | $

Unix

Unix or Windows command prompt: | >

Windows

name for directories inside directories?

path

What is a path?

a name for directories inside directories; | a set of directions to the computer for where you want to put something in the tree of folders;

What is the "graphical file browser" (or "graphical user interface") on a Mac?

Finder

What does "cd .." do?

moves up one directory (to parent directory)

What does "cd ../.." do?

moves up two directories (to parent's parent directory)

What does CLI mean?

Command Line Interface

alternate names for CLI

terminal; bash; (command line) prompt;

What does GUI mean?

Graphical User Interface

move to root directory

cd /

move to home directory

cd ~

What is the "graphical file browser" or ("graphical user interface") for Windows?

Windows Explorer

What does 'ls -1R' do?

prints all sub-directories

What does 'mkdir -p' do?

creates a directory path (even if directories in path haven't yet been created)

touch

create new file (in current directory)

cp -r

``` cp -r [directory_name] [new_directory_name] copy directory (and its contents) and create new_directory_name ```

What does 'rm -rf [directory]' do?

removes specified directory and all of its contents

What does 'rm -r [directory]' do?

removes specified directory (if it is empty) | - if directory is not empty, use 'rm -rf [directory]'