Help with LINUX!! Exercise 1: Enter the following: $whereis ls Write down the an

Question

Help with LINUX!!

Exercise 1:

Enter the following:

$whereis ls

Write down the answer

Exercise 2:

Check the PATH value by entering the following command:

$echo $PATH

Write down the output

Exercise 3:

Enter the following:

$cd ~ (Note: ~ symbol means your home directory)

$which whereis

Write down the output

Exercise 4:

Enter the set of commands below:

$PATH=~/bin:$PATH

$which whereis

Write down the output.

Exercise 5:

Explain the difference in the output from the three whereis commands (from exercises 2 to 4).

Exercise 6:

Check the PATH value again:

$echo $PATH

Is the output the same as in exercise 1? Explain why.

Exercise 7:

Create a file on your home directory called testingfind.txt Enter the following:

$find /space1 -name testingfind.txt –print

Write the output and explain

Exercise 8:

Enter the following:

$find /etc -name s* -print

Understand the output, and write down the output.

Exercise 9:

Write the find command to locate a file called protocols anywhere on your machine.

Exercise 10:

Enter the following command:

3 $grep www /etc/mail

Write down the output and explain the information provided.

Exercise 11:

Create a file called “data”, which contains some text content and numerical value content. Then write two grep commands to find and print all the lines in this “data” file that contain at least one non-alphabetic character: grep '[^A-Za-z]' data

What command would you use to find all the lines that do not contain even a single alphabetic character?

Explanation / Answer

Help with LINUX!!
Exercise 1:
Enter the following:
$whereis ls
Write down the answer (This is the location where the ls binary is located.)
/bin/ls

Exercise 2:
Check the PATH value by entering the following command:
$echo $PATH
Write down the output (This is where the environment variable $PATH is pointing to.
/Users/AnandaKumarThummapudi/.rvm/gems/ruby-2.1.1/bin:/Users/AnandaKumarThummapudi/.rvm/gems/ruby-2.1.1@global/bin:/Users/AnandaKumarThummapudi/.rvm/rubies/ruby-2.1.1/bin:/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/opt/local/lib/postgresql83/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/local/MacGPG2/bin:/usr/texbin:

Exercise 3:
Enter the following:
$cd ~ (Note: ~ symbol means your home directory)
$which whereis
Write down the output (This is the location where the whereis binary is located, within the PATH.)
/usr/bin/whereis

Exercise 4:
Enter the set of commands below:
$PATH=~/bin:$PATH (This will add /bin to the $PATH variable.)
$which whereis   (This is the location where the whereis binary is located, within the PATH.)
Write down the output.
/usr/bin/whereis

Exercise 5:
Explain the difference in the output from the three whereis commands (from exercises 2 to 4).
In Exercise 2, the $PATH value is being showed, whereas, in Exercise 3, we're locating the
whereis withn $PATH. And in Exercise 4, you're adding the ~/bin to the $PATH variable.
And now, tries to locate the whereis with the new $PATH.
Exercise 6:
Check the PATH value again:
$echo $PATH
Is the output the same as in exercise 1? Explain why.
No, the output is not the same as that in 1, this is because, we are appending something
to the existing value of $PATH in instruction 4.

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