Class 20

Question 1

What command would you run to see the last 20 commands you ran at the command line?

Answer 1

history 20

Question 2

What is the pathname of the file that, by default, stores the commands you have run in a file so that they will be remembered for the next time you log in?

Answer 2

~/.bash_history

Question 3

What command would you use to edit the last command to run, change it and run it again?

Answer 3

fc

Question 4

What is the name of the library of procedures that allows you to edit the command line?

Answer 4

the Readline library

Question 5

Name the three things that can be completed at the command line by hitting Tab.

Answer 5

pathnames, commands, shell variables

Question 6

What do you call a shortcut that is used to run a command?

Answer 6

an alias

Question 7

What would you write at the command line to create the alias ghdir which changed directory to my home directory?

Answer 7

alias ghdir=’cd ~ghoffman’

Question 8

Can you write a function on a single command line?

Answer 8

yes if every command is followed by a ;, including the last

Question 9

Can aliases be made global?

Answer 9

no

Question 10

Can functions be made global?

Answer 10

no