Lunix Question 1 10

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Question 1

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Consider the following directory listing:

._x000D_
└── dir1_x000D_
    └── subdir1_x000D_
        └── file.txt

Your current directory is dir1. What is the resulting directory tree after running these commands:

[you@blue final]$ mkdir dir2_x000D_
[you@blue final]$ mv subdir1 ../dir2

Question 2

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You want to know how many regular files that end with the “.txt” extension exist in your home directory (including any subdirectory). Provide a command that will return that information.

For example, imagine this is a tree listing of your home directory:

._x000D_
├── dir1_x000D_
│   ├── foo.jpg_x000D_
│   ├── hello.txt_x000D_
│   ├── hello.txt.bak_x000D_
│   └── subdir1_x000D_
│       └── bye.txt_x000D_
├── dir2_x000D_
│   └── subdir2_x000D_
│       └── file.txt_x000D_
├── file.pdf_x000D_
└── file.txt

When you run your command, the output should be:

4

Question 3

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Look at the following output:

total 16_x000D_
drwxrwxr-x 4 you   you   4096 May 10 20:34 ._x000D_
drwxrwxr-x 4 you   you   4096 May 10 19:35 .._x000D_
-rw-rw-r-- 1 you   you      0 May 10 20:34 .bar_x000D_
drwxrwxr-x 3 you   you   4096 May 10 19:56 dir1_x000D_
drwxrwxr-x 3 you   you   4096 May 10 19:52 dir2_x000D_
-rw-rw-r-- 1 you   you      0 May 10 19:51 file.pdf_x000D_
-rw-rw-r-- 1 you   you      0 May 10 19:51 file.txt

which of the following commands produced that output:

Select one:

ls -l

ls -la

ls -lha

ls -lth

ls -lt

Question 4

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Provide a command that will output all the possible combinations with repetition of the characters a, b and c.

The output of your command should be:

aaa aab aac aba abb abc aca acb acc baa bab bac bba bbb bbc bca bcb bcc caa cab cac cba cbb cbc cca ccb ccc

Question 5

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Replace XXX with the appropriate argument in the following mkdir command so it will create the directories listed below:

[you@blue final]$ mkdir <strong><i>XXX</i></strong>_x000D_
[you@blue final]$ ls_x000D_
prod-docs-2001  prod-log-2006  qa-docs-2001  qa-log-2006  test-docs-2001  test-log-2006_x000D_
prod-docs-2002  prod-log-2007  qa-docs-2002  qa-log-2007  test-docs-2002  test-log-2007_x000D_
prod-docs-2003  prod-log-2008  qa-docs-2003  qa-log-2008  test-docs-2003  test-log-2008_x000D_
prod-docs-2004  prod-log-2009  qa-docs-2004  qa-log-2009  test-docs-2004  test-log-2009_x000D_
prod-docs-2005  prod-log-2010  qa-docs-2005  qa-log-2010  test-docs-2005  test-log-2010_x000D_
prod-docs-2006  prod-src-2001  qa-docs-2006  qa-src-2001  test-docs-2006  test-src-2001_x000D_
prod-docs-2007  prod-src-2002  qa-docs-2007  qa-src-2002  test-docs-2007  test-src-2002_x000D_
prod-docs-2008  prod-src-2003  qa-docs-2008  qa-src-2003  test-docs-2008  test-src-2003_x000D_
prod-docs-2009  prod-src-2004  qa-docs-2009  qa-src-2004  test-docs-2009  test-src-2004_x000D_
prod-docs-2010  prod-src-2005  qa-docs-2010  qa-src-2005  test-docs-2010  test-src-2005_x000D_
prod-log-2001   prod-src-2006  qa-log-2001   qa-src-2006  test-log-2001   test-src-2006_x000D_
prod-log-2002   prod-src-2007  qa-log-2002   qa-src-2007  test-log-2002   test-src-2007_x000D_
prod-log-2003   prod-src-2008  qa-log-2003   qa-src-2008  test-log-2003   test-src-2008_x000D_
prod-log-2004   prod-src-2009  qa-log-2004   qa-src-2009  test-log-2004   test-src-2009_x000D_
prod-log-2005   prod-src-2010  qa-log-2005   qa-src-2010  test-log-2005   test-src-2010

Question 6

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Recall the /etc/passd file, which contains a list of users and their properties. Provide a command that will print the user that has the highest user ID (when comparing using numerical value). For example, when run in blue.cs.sonoma.edu, your command should produce the following output (since user nfsnobody has the largest ID of 65534)

The user with the highest ID is nfsnobody

Question 7

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Provide a command that will assign the number of users in /etc/passwd to an environment variable called TOTAL_USERS.

Recall that environment variables can be verified by using the env command. For example, after running your command that sets the environment variable TOTAL_USERS, you can verify by executing the following command (there were 1077 users in blue when this question was written).

[you@blue final]$ env | grep TOTAL_USERS_x000D_
TOTAL_USERS=1077

Question 8

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Create a shell script that will take 1 argument and will end with a success exit code if the argument is a whole word in the /usr/share/dict/words file, and it will return an error signal of 1 if the argument is not a word on that file.

Your script should not produce any output

For example, if your script is called isvalid.sh, then you will see the following output (bad is a word in the dictionary, badd is not a word in the dictionary):

[you@blue final]$ ./isvalid.sh bad_x000D_
[you@blue final]$ echo $?_x000D_
0_x000D_
[you@blue final]$ ./isvalid.sh badd_x000D_
[you@blue final]$ echo $?_x000D_
1

Question 9

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In Lab. No 1 we made calls to the Internet Chuck Norris Data Base API using curl. Write a script that takes a joke number as an argument and prints the joke to the screen.

For example, if your script is called chuck.sh, then you should have the following output:

[you@blue final]$ ./chuck.sh 458_x000D_
Chuck Norris can write infinite recursion functions and have them return._x000D_
[you@blue final]$ ./chuck.sh 459_x000D_
Chuck Norris can solve the Towers of Hanoi in one move._x000D_
[you@blue final]$ ./chuck.sh 460_x000D_
The only pattern Chuck Norris knows is God Object.

Question 10

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The driver’s licenses in the island nation of Lilliput follow the format XYX-1111-A (three alphabetic characters followed by a hyphen followed by a four digit number, followed by another hyphen and finally another character that indicates the license type which can only be B for Bicycle, C for Carriage, D for Donkey Cart and A for All.)

Write a script that takes an argument and returns a success exit code if the argument is a valid Lilliputian drivers license or 1 if it is not a valid one. For example, if your script is called dlcheck.sh:

[you@blue final]$ ./dlcheck.sh ACV-13-A_x000D_
[you@blue final]$ echo $?_x000D_
1_x000D_
[you@blue final]$ ./dlcheck.sh ACV-13119-A_x000D_
[you@blue final]$ echo $?_x000D_
1_x000D_
[you@blue final]$ ./dlcheck.sh ACV-1319-A_x000D_
[you@blue final]$ echo $?_x000D_
0_x000D_
[you@blue final]$ ./dlcheck.sh ACV-1319-Y_x000D_
[you@blue final]$ echo $?_x000D_
1

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