Network Operating Systems GREP Command Quiz

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Questions and Answers

What does the `grep` command do?

The grep command is used to search for a pattern of characters in a file and display the matching lines.

What is the purpose of regular expression in searching text?

Regular expression provides the ability to match a string of text in a flexible and concise manner.

What does the `-w` option do in the `grep` command?

It ignores the line of the searched string.

It searches for the entire word only. (correct)

It searches for the matched line number.

It searches for the entire pattern only

By default, the `grep` command is Case-Sensitive.

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How can you make the `grep` command Case-Insensitive?

The <code>-i</code> option makes the <code>grep</code> command Case-Insensitive. Signup and view all the answers

What is the purpose of the `-v` option in the `grep` command?

It ignores the line of the searched string. Signup and view all the answers

Which option in the `grep` command will print `N' lines after the matched line?

-A Signup and view all the answers

Which option in the `grep` command will print 'N' lines before the matched line?

-B Signup and view all the answers

Which option in the `grep` command will print 'N' lines around the matched line?

-C Signup and view all the answers

What are aliases in Linux?

Aliases are custom shortcuts used to represent a command or set of commands, executed with or without custom options. Signup and view all the answers

How do you list all defined aliases in Linux?

You can use the <code>alias</code> command to display a list of all currently defined aliases on your profile. Signup and view all the answers

How to define an alias temporarily in Linux?

To define an alias temporarily, you can use the command <code>alias alias_name='your_command'</code>. Signup and view all the answers

How to define an alias permanently?

To make an alias permanently defined in Linux, you need to set it in the <code>.bashrc</code> file, which is the configuration file for the bash shell. Signup and view all the answers

How do you remove an alias in Linux?

You can remove an alias in Linux using the command <code>unalias alias_name</code>. Signup and view all the answers

Study Notes

Network Operating Systems - GREP and Aliasing

Regular expressions allow flexible and concise matching of text strings. Text strings can be a single character, word, sentence or a pattern of characters.

GREP Command

grep (Global Regular Expression Print) command prints lines of text matching a regular expression.
Displays a list of lines matching a pattern within a text file.
The presented examples use grep with a target text file named names.txt. This file contains a list of names.

Searching in Files

To find a specific line in names.txt, use grep "Brad William" names.txt.

Whole Word Match

Using grep -w "Brad Williamson" ensures only complete words match.

Case-Insensitive Search

grep -i "Chris Evans" or grep -wi "Chris Evans" perform a case insensitive search.

Line Numbering

grep -n "Chris Evans" displays the line number of matching lines.

Displaying Lines Around Matches

grep -A 2 "Chris Evans" shows the matched line and the two following lines.
grep -B 2 "Chris Evans" displays the matched line and the two preceding lines.
grep -C 2 "Chris Evans" shows the matched line and the two lines before and after the matched line.

Printing Only Matched Strings

grep -o "Chris" prints only the matched substring "Chris".
grep -oi "Chris" performs the same operation while ignoring case.
Using the -o option to extract matched strings only instead of complete lines.

Aliases

Aliases are custom shortcuts for commands or sets of commands.
Aliases are only active during a specific shell session.

Listing Aliases

The alias command displays defined aliases.

Defining Aliases Temporarily

alias shortname='your custom command here' sets a temporary alias; the alias is discarded when the current session ends.

Defining Aliases Permanently

Defining an alias permanently requires modification of the .bashrc file. These changes make the alias available for all subsequent sessions using the same shell. A .bashrc example was given.

Removing Aliases

unalias ls removes the alias for a command.

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Description

Test your knowledge on the GREP command in Network Operating Systems. This quiz covers key concepts such as regular expressions, case-insensitive searches, and line numbering. Prepare to demonstrate your understanding of searching through text files effectively.

Network Operating Systems GREP Command Quiz

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Questions and Answers

What does the grep command do?

What is the purpose of regular expression in searching text?

What does the -w option do in the grep command?

By default, the grep command is Case-Sensitive.

How can you make the grep command Case-Insensitive?

What is the purpose of the -v option in the grep command?

Which option in the grep command will print `N' lines after the matched line?

Which option in the grep command will print 'N' lines before the matched line?

Which option in the grep command will print 'N' lines around the matched line?