command-line-basics

Question 1

What is a CLI?

Answer 1

Command-line interface processes commands to a computer program in the form of lines of text. The program which handles the interface is called a command-line interpreter or command-line processor.

Question 2

What is a GUI?

Answer 2

graphical user interface is a form of user interface that allows users to interact with electronic devices through graphical icons and audio indicator such as primary notation, instead of text-based user interfaces, typed command labels or text navigation.

Question 3

Give at least one use case for each of the commands listed in this exercise.
man
cat
ls
pwd
echo
touch
mkdir
mv
rm
cp

Answer 3

**man
open the user manual
man ls
Display the manual page for the item (program) ls.
**cat filename
print the contents of files.
**ls
list information about the files.
ls -a list all, do not ignore entries starting with .(dot)
-F append indicator(one of */=>@|) to entries
**pwd - print name of current/working directory
** echo - display a line of text
**touch - change file timestamps, create new file
**mkdir - make(create) directories
-p, –parents
no error if existing, make parent directories as needed
**mv - move (rename) files (source dest)
**rm - remove files or directories
rm -r remove dir and its files recursively
**cp - copy files and directories
Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
**history - GNU History Library
Many programs read input from the user a line at a time. The GNU History library is able to keep track of
those lines, associate arbitrary data with each line, and utilize information from previous lines in com‐
posing new ones.

Question 4

What are the three virtues of a great programmer?

Answer 4

laziness, impatience, hubris