Self-Test questions for the SIB UNIX scripting course

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This quiz is meant for course applicants to assess their knowledge level in UNIX/shell programming.

If you are not able to answer most of the questions correctly, it is an indication that you may need to gain a deeper understanding of the corresponding topic(s) before you are able to fully benefit from the course. Ideally, you should have a minimum of 8 to 10 points out of 15 possible

Email *

Which part the following command is an option? *

2 points

none

-l

Unix commands do not have options

both ls and -l

How can I obtain help about the mv command? *

2 points

manual mv

mv help

man mv

describe mv

help mv

Suppose you are logged in as myself, and currently working in /home/myself/project/. Which of the following commands will bring you to your home directory? *

2 points

cd .

cd /home/myself

cd $HOME

cd ..

Required

Which of the following terms best describes any document that is not text in the sense of a Unix text file? *

1 point

CSS

graphics

binary

HTML

PDF

What operator(s) redirect(s) a command’s output into a file (possibly, but not necessarily, creating or deleting it beforehand)? *

2 points

Required

Why does the following command not replace myfile with a sorted version of itself? *

1 point

the file to be sorted and the output file must both be passed as arguments

redirections occur before execution, so myfile is empty when "sort" runs

"myfile" has the wrong permissions

"sort" always deletes its argument

the file to be sorted must be passed as an argument

Required

These two commands work without problems and produce the same output: *

1 point

tr is not allowed to read /etc/passwd for security reasons

tr expects its input in a file named by its first argument

tr expects its input in a file named by its third argument

tr expects its input in a file named by its second argument

tr expects its input on standard input

What would be the most straightforward way of displaying the first ten lines of file myfile that contain the string GAATTC? *

2 points

grep GAATTC > tmp; head < tmp

find GAATTC < myfile -n 10

grep GAATTC > tmp; head < tmp; rm tmp

grep GAATTC < myfile | head

head < myfile | grep GAATTC

What is not optimal with this? *

1 point

The regular expression is wrong

There will be a bottleneck because cat is much slower than grep

There must be a ‘<’ before myfile

There is nothing wrong with this command

cat is unnecessary and wastes resources

You are given a file named sci_names.txt with scientific names, one per line, as follows: *

1 point

A 100-line Python script

cut -d ' ' -f1 < sci_names.txt | sort | uniq -c | sort -k1,1rn

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