Linux and Bash for Data Engineering Week2

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School

Grand Rapids Community College *

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MISC

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Computer Science

Date

Dec 6, 2023

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docx

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Uploaded by ConstableWildcatMaster401

Congratulations! You passed! Grade received 90% Latest Submission Grade 90% To pass 80% or higher Go to next item 1. Question 1 Explain the purpose of the ~/.bashrc file. 1 / 1 point It is a Bash shell script that runs whenever Bash is started interactively. It is a Bash login shell that only runs at the start of a new login shell. It is a Bash logout shell that only runs when a shell exits. Correct You got it! This script is used to configure your shell environment for interactive use. 2. Question 2 What is the purpose of the ~/.zshrc file? 1 / 1 point It is a ZSH shell script that runs whenever Bash is started interactively. It is a ZSH login shell that only runs at the start of a new login shell. It is a ZSH logout shell that only runs when a shell exits. Correct You got it! This script is used to configure your shell environment for interactive use. 3. Question 3 What shell example creates a shell variable to the current shell only. 1 / 1 point echo $FRUIT FRUIT="cherry" export FRUIT="cherry" Correct You got it! Setting a variable makes the 4. Question 4 What would be the output of this command? FRUIT="Cherries"; echo $FRUIT are tasty 1 / 1 point echo Cherries are tasty Cherries are tasty $FRUIT are tasty Correct You got it! The shell variable value prints out as part of the echo command. 5. Question 5

When you run the command alias from a terminal what will you see? 1 / 1 point It will display the help menu for a command. It will print the name of the shell currently in use. You will see output like the following: alias egrep='egrep --color=auto' alias fgrep='fgrep --color=auto' alias grep='grep --color=auto' alias l.='ls -d .* --color=auto' alias ll='ls -l --color=auto' alias ls='ls --color=auto' alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde' Correct You got it! The output of the alias command shows the currently set aliases for the shell environment. 6. Question 6 What is a good example of what appears in standard out? 0 / 1 point The content of a file. It is always blank. Errors from the improper execution of a shell command. Incorrect Not quite. Errors get sent to stderr. 7. Question 7 What is the output of this command? ls fakefile.txt &>/dev/null 1 / 1 point There is no output. It will display the following error. ls: cannot access fakefile: No such file or directory It will create the file since it doesn't exist. Correct You got it! 8. Question 8 What would the following command do? ls fakefile 2>error.txt 1 / 1 point Write stdout to error.txt It deletes the output of stderr Write stderr to error.txt Correct You got it! The error from this command would write out to error.txt . Here is what would happen if you used the less command to read it. less error.txt ls: cannot access fakefile: No such file or directory

9. Question 9 What would this command do? for i in {1..10}; do echo $RANDOM >> rando.txt; done 1 / 1 point It throws away the output of standard out. It appends 10 random numbers to a file. It overwrites a file with a new random number 10 times. Correct You got it! The >> operator appends the output to a file. For every execution of a command using this operator, it will append new content to the file. 10. Question 10 What is happening in the following shell command? sort -r < /etc/passwd 1 / 1 point The /etc/password file is overwritten with a sorted version The sort command is appending to the /etc/password file. The /etc/password file is reverse sorted. Correct You got it! The sort command can accept input redirection and this command reverse sorts the content of the file.

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