Linux+ Shell Basics

shell type: tcsh

An improved version of csh. It offers command line editing and completion features that are not available with csh.

su

Switch users in the shell prompt

shell type: sh

The Bourne shell is an earlier version of bash, and is similar in many ways. Originally Bourne.

shell type: bash

The Bourne-agin shell is the default shell used by most Linux distributions. It uses commands similar to a UNIX shell.

shell type: csh

The C-shell uses synatx similar to the syntax used in the C programming language.

shell type: ksh

The Korn shell provides scripting features not found in bash. Developed by David Korn.

shell type: zsh

The Z Shell is an improved version of bash and is available on many Linux distributions.

history

What command should you enter to see a list of all the commands you recently used at the command prompt?

All system information is displayed on the screen.

What is the result of the uname -a command?

pwd

What would you enter at the command prompt to display the present working directory?

bash

What would you enter at the command prompt to start a new Bourne-again shell (bash) session?

Bourne-again shell (bash)

Which of the following options is the standard shell for most Linux computers?

./ni /root/ni

You have an executable file named ni that allows you to save a snapshot of your network information with the date and time into a log file. The file is in the /root directory, and /root is the current working directory. How would you run the executable file?

exec ./myapp

You have the my app executable file. It is found in the current working directory, but not in the command path. What should you type at the command prompt to start the my app file and replace the shell with the my app process

cd

change directions

chsh

change the default shell

red

compressed

blue

directories

whoami

display the current username

To add a directory to a path

enter PATH=$PATH:[directory_path]; them enter export PATH

clear

erase the shell screen

green

executable files

exec

execute an executable and to replace the shell process with new process created by the executable file

command path

is a set of directories to be searched to find the executable files of the commands entered at the shell prompt

Linux

is an operating system. It's not an application that runs on top of Windows or some other operating system.

Linux shell

is the Command Line Interface (CLI) or Text User Interface (TUI) that administrators use to control a Linux operating system.

exit

leave out the login shell or to go back to the original user after using the su command

cyan

links

tilde symbol (~)

points to the home directory of the current user

uname

print system information. Be aware of the following uname options: -a prints all systems info. -o prints the operating system. -p prints the processor's architecture type.

Is

show names of the files and directories in the current directory

white

text files

enter echo $PATH

to see the path