{ "q1": { "type": "order", "question": "\n

\nOrder the following networking utilities to match the descriptions\nbelow.\n

\n\n

\n

    \n\n
  1. Find the ip address of all the networking devices on the current\n machine.
  2. \n\n
  3. Find the ip address of a remote machine along with other DNS\n records.
  4. \n\n
  5. Measure the latency to a remote machine or check if another\n machine is responsive.
  6. \n\n
  7. Securely transfer a file from one machine to another.
  8. \n\n
  9. Synchronize files between machines.
  10. \n\n
  11. Download a file from a website.
  12. \n\n
  13. List what ports or services are available on the current machine.
  14. \n\n
  15. Scan a remote machine to see what ports are open.
  16. \n\n
  17. Make arbitrary network connections to a remote machine.
  18. \n\n
  19. List the machines traversed in a network connection.
  20. \n\n
\n

\n\n

\nNote: You may need to lookup additional resources for some of these commands.\n

\n", "responses": { "host": "host", "scp": "scp", "curl": "curl", "rsync": "rsync", "nmap": "nmap", "nc": "nc", "ping": "ping", "ip": "ip", "ss": "ss", "traceroute": "traceroute" } }, "q2": { "type": "blank", "question": "\n

\nUse the find command on the /etc folder on\nstudent10.cse.nd.edu to answer the following questions:\n

\n\n

\n

    \n\n
  1. How many files are there? ____
  2. \n\n
  3. How many directories are there? ____
  4. \n\n
  5. How many executable files are there? ____
  6. \n\n
  7. How many empty files are there? ____
  8. \n\n
  9. How many files and directories have the string 'host' in the name? ____
  10. \n\n
\n

\n" }, "q3": { "type": "blank", "question": "\n

Given the following output of ls -l:

\n\n
\n-rw-r--r-- 1 pbui pbui  23 Jan 18 15:39 README.md\n-rw-r--r-- 1 pbui pbui 155 Jan 25 01:15 exists.sh\n
\n\n

And the following script, exists.sh:

\n\n
\n#!/bin/sh\n\nif test -e \"$1\"; then\n    echo \"$1 exists!\"\nelse\n    echo \"$1 does not exist!\"\nfi\n
\n\n

\n

    \n
  1. How would you run the script even though it is not executable? ____
  2. \n
  3. How would you make this script executable? ____
  4. \n
  5. Once this script is executable, how would you run it directly? ____
  6. \n
  7. What environment variable would you modify to allow you to run this script from any directory using just its name (ie. exists.sh)? ____
  8. \n
\n

\n" }, "q4": { "type": "multiple", "question": "\n

\nGiven the exists.sh script in Q3, which of the\nfollowing statements are true (choose all that apply)?\n

\n", "responses": { "extension": "The #!/bin/sh line specifies the file extension.", "shebang": "The #!/bin/sh line specifies the interpreter to use when the script is executed.", "number": "The $1 represents the number 1.", "argument": "The $1 represents the first argument to the script.", "variable": "The test -e line checks if the number referenced by the variable exists.", "file": "The test -e line checks if the file referenced by the variable exists." } }, "q5": { "type": "blank", "question": "\n

We wish to create a new version of the exists.sh script in\nQ3 with the following modifications:

\n\n

\n

    \n\n
  1. Use [ instead of test for the conditional.
  2. \n\n
  3. Check every command line argument (one at a time).
  4. \n\n
  5. Return an error code (1) if one of the checks fails.
  6. \n\n
  7. Display an error message and exit with an error if no arguments are given.
  8. \n\n
\n

\n\n

Fill in the missing code in the script below to complete this new\nversion of exists.sh:

\n\n
\n#!/bin/sh\n\n# Check if there are no arguments\nif [ \"____\" ____ 1 ]; then\n    \u00a0\u00a0\u00a0echo \"Usage: exists.sh file0...\"\n    \u00a0\u00a0\u00a0exit ____\nfi\n\n# Check each command line argument\nEXITCODE=____\nfor arg in \"____\"; do\n    # Check if argument exists\n    if [ ____ \"____\" ]; then\n        echo \"____ exists!\"\n    else\n        echo \"____ does not exist!\"\n        EXITCODE=____\n    fi\ndone\n\nexit ____\n
\n" } }