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my homework 1 #10

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HW1
Mar 2, 2026
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My Homework1
Mar 3, 2026
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25 changes: 17 additions & 8 deletions script.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -20,24 +20,26 @@ echo ""


# 0. Tell me who worked on this together
echo "student 1" # please fill in names here
echo "student 2"

echo "Lorenzo Castro" # please fill in names here
echo "Caterina de gaetano"
echo "Paolo Dioatallevi"
# here is a list of tasks for you.
# whenever a line says "don't touch" then you are not supposed to touch what comes below.
# all lines where you need to take action are numbered.

# 1. Go to your home directory:

cd

# 2. from your home, creating a directory structure: new folder `programming-hw`, and inside that folder create folder `hw1`

mkdir -p ~/programming-hw/hw1
# 3. go into that new directory, i.e. into ~/programming-hw/hw1
cd ~/programming-hw/hw1

# checking the folder exists now
# don't touch
[ -d ~/programming-hw/hw1 ] && echo "directory created successfully" || exit 1


# download with wget if file does not exist yet
# if wget does not work for you, manually download from the below URL and place into `~/programming-hw/hw1` as `movies.dat`
# first let me check whether you have wget installed and install it otherwise for you:
Expand All @@ -60,10 +62,11 @@ if [ ! -f movies.dat ]; then
fi

# 4. look at first 4 rows of downloaded data in `movies.dat`. look at this output and try to understand how it is structured. the file ending is `dat`. however, how could you also denominate such a file?

head -n 4 movies.dat
## it could be reanamed as txt file

# 5. look at first 4 rows of downloaded data in `movies.dat` redirect to a file called `first4.txt`

head -n 4 movies.dat > first4.txt

# don't touch
if [ ! -f first4.txt ]; then
Expand Down Expand Up @@ -94,30 +97,36 @@ echo ""

# awk -F '::' '{print $3}' _filename_

awk -F '::' '{print $3}' movies.dat

# 7. observe that the `{print $3}` part prints the third field. that looks like: genre1|genre2
# that is, there is *another* separator in this column, `|`. Let's separate again. copy your command from above and
# add a pipe as follows. here, the second statement will split at `|` and print into *how many parts* it has split.
# i.e. it will tell us *how many genres* that movie belonged to. No need to understand the `awk` part.
# again, remove the # below, fill in for _filename_ and run

# awk -F '::' '{print $3}' _filename_ | awk '{print split($0, a, "\\|")}'
awk -F '::' '{print $3}' movies.dat | awk '{print split($0, a, "\\|")}'


# 8. finish the pipeline by adding 2 commands, exactly like in class, that will produce a contingency table
# we want to know how many movies belong to 0,1,2,... etc genres.

# awk -F '::' '{print $3}' _filename_ | awk '{print split($0, a, "\\|")}' | sort | uniq -c

awk -F '::' '{print $3}' movies.dat | awk '{print split($0, a, "\\|")}' | sort | uniq -c

# 9. redirect (>) the output of your pipeline to a file `outtable.txt` in the current directory

awk -F '::' '{print $3}' movies.dat | awk '{print split($0, a, "\\|")}' | sort | uniq -c > outtable.txt

# dont touch
echo "" # leave this untouched
echo "here is my table:" # this as well

# 10. Print your table to screen


cat outtable.txt

#### End of your tasks
# please do not modify the below lines
Expand Down