[LINUX]

I need explainations/or answers for these questions. Please put in bold.

1.Know the difference between a command, an option, and an argument.

rm -rf zorko

2.How many commands are here? What are they? 3.How many options? What are they? 4.How many arguments? What are they?

5.Know how to redirect input and output, and know how to append to an existing file. Example: run /usr/local/task with input redirected from blah.txt, and the output appended to file tylk.data

6.Know how to pipe commands to one another. Example: do a long listing of directory /etc/init.d and pipe the output to the wc utility. ls -l /etc/init.d | wc

7.Know how to append files to your PATH (either at the beginning or end of the current PATH) variable.

8.Know how to run a program in the background, and bring it to the foreground.

9.How do you run a program in your current directory, if that directory isn't in your PATH?

10.Know how to use wildcards in file names.

11.Know what * and ? and [ ] do.

12.Know everything about the vi editor and the vim editor: know the main commands that get you into insert mode know the difference between A, I, O, and a, i, o from command mode, know how to move one word, sentence, or paragraph at a time. remember that repetition count comes before the command in command mode, not after; thus, it's 6d, not d6. In last line mode, know about special "line numbers" like . and $ Know how to do search and replace (first occurrence in a line vs. all occurrences in a line) Know how to specify a line or a range of lines: line 3 3 lines 3 through 5 3,5 current line through end .,$ next line with blah on it /blah/ Know how to read a file into the current work buffer Know how to write a file and give it a name

13.Putting multiple shell commands on one line

14.Redirecting standard input, standard output, and standard error

15.Piping the output of one command to another commands input

16.Changing permissions of a file for the user, group, and other

17.Setting the primary and secondary user prompts

18.Creating and deleting aliases

19.Writing shell comments

20.Shell wildcards

21.Running programs in the background, both with the bg command and by adding a special shell character to a command.

22.Finding the characteristics of the history (file name, history file size, etc.)

23.Using the ! command to re-execute commands from the history

24Modifying (substituting) parts of a command brought back from history

25.Declaring and using shell variables

26.Using the pushd and popd commands

27.Reading a bash script and determining what it will do; know about file tests, for, if, else, and elif