Command Prompts

Question 1

How to determine current Ruby Installed?

Answer 1

ruby -v

Question 2

How to determine current Rails Installed?

Answer 2

rails –help

Question 3

How to select the version of Ruby to use?

Answer 3

rvm use …version number

Question 4

How do you create a local GIT for your app?

Answer 4

git init

Question 5

How do you add files to local GIT?

Answer 5

git add . (the dot means the current open directory).

Question 6

What does the (-m) mean in the following command code?

git commit -m “Rails Beginning App Created Status”

Answer 6

The (-m) means that we are adding a message to our git commit.

Question 7

How do you see what the current status of GIT is?

Answer 7

git log

Question 8

What does the following code result in?

rake routes

Answer 8

displays all of the url’s and methods available for use in the application.

Question 9

pwd

Answer 9

print working directory

Question 10

hostname

Answer 10

my computer’s network name

Question 11

mkdir

Answer 11

make a new directory

Question 12

cd

Answer 12

change directory

Question 13

ls

Answer 13

list directory

Question 14

rmdir

Answer 14

remove directory

Question 15

popd

Answer 15

pop directory

Question 16

cp

Answer 16

copy a file or directory

Question 17

mv

Answer 17

move a file or directory

Question 18

less

example $ less file.txt

Answer 18

page through a file / will enter into file on the command prompt and will not return to prompt.
(enter q to quite out)

Question 19

cat

Answer 19

print the whole file

Question 20

xargs

Answer 20

execute arguments

Question 21

find

Answer 21

fine files

Question 22

grep

Answer 22

find things inside files

Question 23

man

Answer 23

read a manual page

Question 24

apropos

Answer 24

find what man page is appropriate

Question 25

env

Answer 25

look at your environment

Question 26

echo

Answer 26

print some arguments

Question 27

export

Answer 27

export/set a new environment variable

Question 28

exit

Answer 28

exit the shell

Question 29

sudo

Answer 29

DANGER! become a super user root DANGER!

Question 30

chmod

Answer 30

change permission modifiers

Question 31

chown

Answer 31

change ownership

Question 32

cd ..

Answer 32

go up one directory

Question 33

touch

exemple $ touch newemptyfile.txt

Answer 33

creates a new file

must name file

Question 34

more

example $ more file.txt

Answer 34

will display the file in the command prompt and then exit out to new command prompt

Question 35

cat newfile1.txt&raquo_space; newfile2.txt

Answer 35

will append info from file on left and append to file on right (permanent)

Question 36

ls .txt or ls ex.*

Answer 36

The * is a wildcard search item

Question 37

What does this command line input do?

find . -name “*.txt” -print | less

Answer 37

In directory . (or the current directory) find files with -NAMES that have a (wild card) .txt, the print file names to a new screen by using the less command

Question 38

cat > newfile1.txt

Answer 38

This will open a new prompt and then you type in what you wish to add to the file, then press command -d to exit out.

Question 39

grep thisword *.txt

Answer 39

searches for the word “thisword” in any file in the current directory that has the wild card .txt file ending.

Question 40

$ man find

does what?

Answer 40

search help files by typing “man”

examples: man find; man less; man man; man grep. must select q to quit out.