Top 15 Linux Commands

Question 1

What is Linux command cd?

Answer 1

Change directory allows you to navigate to another directory.

Example: cd downloads
Example: cd /etc/
Example: cd .. (Directory up!)

Question 2

What is Linux command man?

Answer 2

Shows the users the manual of the command. In case you need to get more information about the command.

Example: man cp
Note: to close the manual simply press “Q”

Question 3

What is Linux command ls?

Answer 3

ls lists the files/directories within a directory

Example: ls

Question 4

What is Linux command cp?

Answer 4

The command command is available for us to copy things. Useful for duplicating files.

Example: cp file file2

Question 5

What is Linux command mv?

Answer 5

mv command is used for move operations, allows users to move a file/directory to a specified location.

Example: mv /home/bas/Desktop/bla /home/bas/desktop/fiets

Question 6

What is Linux command mkdir

Answer 6

This command is used to make directories, not files.

Example: mkdir testdirectory

Question 7

What is Linux command rmdir?

Answer 7

rmdir is used to remove directories.

Example: rmdir fiets

Question 8

What is Linux command touch?

Answer 8

Touch command is used to make files.

Example: touch Vogel

Question 9

What is Linux command rm?

Answer 9

This command is used to delete files instead of directories.

Example: rm Vogel

Question 10

What is Linux command tar?

Answer 10

Tar is used to archive files, a way to pack a bunch of files into a single file.

Example: tar -Cvf test.tar test (creating a tar file from directory or file test)

Question 11

What is Linux command pwd?

Answer 11

Pwd stands for path working directory, shows you where you are in the system.

Question 12

What is Linux command ifconfig?

Answer 12

Ifconfig is a command showing you information about the ethernet adapters on your system. It contains very useful information like gateway, ip, and packet statistics.

Example: ifconfig

Note: to gain information about the wireless adapters on your system type iwconfig.

Question 13

What is Linux command locate?

Answer 13

Locate is an extremely fast searching command. It shows the directories or files each on a new line.

Example: locate syslog

Example: locate syslog | more (piping structure used to invert the data from locate to the more command)

Note: some keywords returns enormous amounts of hits. Use MORE to (see example) clear things up a bit.

Question 14

What is Linux command ping?

Answer 14

Ping is used as a network diagnostic command by professionals. Ping offers info about the network we are on and if the other system responds to us. In cases of troubleshooting network related problems, ping can do a great job to determine the domain of the problem.

Example: ping www.google.com
Command returns the interval and % of loss during the test.

Question 15

What is Linux command chmod?

Answer 15

Chmod command comes from “Change Mode” back to the unix times. It’s a great command to restrict access to directories or files. But before I show you an example on how to use it, some theory.

Chmod is quiet an advanced command to use. So therefore you really need to understand how it works. chmod works with so called permission bits. These bits can be set to a certain level of restrictions.

7 full
6 read and write
5 read and execute
4 read only
3 write and execute
2 write only
1 execute only
0 none

Source: http://en.wimipedia.org/wiki/Chmod

Question 16

What is Linux command Sudo?

Answer 16

Linux, Sudo,