London | SDC-July-2025 | Franklin Kamela | Sprint 2 | shell pipelines

individual-shell-tools/awk/script-01.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output just the names of each player in `scores-table.txt`.
 # Your output should contain 6 lines, each with just one word on it.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '{print $1}' $path

individual-shell-tools/awk/script-02.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of each player, as well as their city.
 # Your output should contain 6 lines, each with two words on it, separated by a space.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '{print $1, $2}' $path

individual-shell-tools/awk/script-03.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the score from their first attempt.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 1".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '{print $1, $3}' $path

individual-shell-tools/awk/script-04.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player in London along with the score from their last attempt.
 # Your output should contain 3 lines, each with one word and one number on it.
 # The first line should be "Ahmed 4".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '/London/ {print $1, $NF}' $path

individual-shell-tools/awk/script-05.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the number of times they've played the game.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 3".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '{print $1, NF-2}' $path

individual-shell-tools/awk/script-06-stretch.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the total of adding together all players' first scores.
 # Your output should be exactly the number 54.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '{sum += $3} END {print sum}' $path

individual-shell-tools/awk/script-07-stretch.sh

@@ -7,3 +7,9 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the total of adding all of that player's scores.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 15". The second line should be "Basia 37"
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/awk/scores-table.txt"
+awk '{
+  sum = 0
+  for (i = 3; i <= NF; i++) sum += $i} {
+  print $1, sum
+}' $path

individual-shell-tools/cat/script-01.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the contents of the helper-1.txt file inside the helper-files directory to the terminal.
 # The output of this command should be "Once upon a time...".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files/helper-1.txt"
+cat "$path"

individual-shell-tools/cat/script-02.sh

@@ -11,3 +11,5 @@ set -euo pipefail
 # It looked delicious.
 # I was tempted to take a bite of it.
 # But this seemed like a bad idea...
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files"
+cat "$path"/*.txt

individual-shell-tools/cat/script-03.sh

@@ -9,3 +9,5 @@ set -euo pipefail
 # 1 It looked delicious.
 # 2 I was tempted to take a bite of it.
 # 3 But this seemed like a bad idea...
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files/helper-3.txt"
+cat -n "$path"

individual-shell-tools/cat/script-04-stretch.sh

@@ -13,3 +13,5 @@ set -euo pipefail
 # 3 It looked delicious.
 # 4 I was tempted to take a bite of it.
 # 5 But this seemed like a bad idea...
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files"
+cat "$path"/*.txt | cat -n

individual-shell-tools/grep/script-01.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt said by the Doctor.
 # The output should contain 6 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep/dialogue.txt"
+grep '^Doctor:' "$path"

individual-shell-tools/grep/script-02.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt that contains the word Doctor (regardless of case).
 # The output should contain 9 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep/dialogue.txt"
+grep -i 'Doctor' "$path"

individual-shell-tools/grep/script-03.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the number of lines in dialogue.txt that contain the word Doctor (regardless of case).
 # The output should be exactly the number 9.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep/dialogue.txt"
+grep -i 'Doctor' "$path" | wc -l

individual-shell-tools/grep/script-04.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt that does not contain the word "Hello" (regardless of case).
 # The output should contain 10 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep/dialogue.txt"
+grep -vi 'Hello' "$path"

individual-shell-tools/grep/script-05.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt that contains the string "cure", as well as the line before that line.
 # The output should contain two pairs of two lines of text (with a separator between them).
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep/dialogue.txt"
+grep -B 1 'cure' "$path"

individual-shell-tools/grep/script-06.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the name of every `.txt` file in this directory which contains a line of dialogue said by the Doctor.
 # The output should contain two filenames.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep"
+grep -l '^Doctor:' "$path"/*.txt 

individual-shell-tools/grep/script-07.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output, for each `.txt` file in this directory, how many lines of dialogue the Doctor has.
 # The output should show that dialogue.txt contains 6 lines, dialogue-2.txt contains 2, and dialogue-3.txt contains 0.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/grep/"
+grep -c '^Doctor:' "$path"*.txt | sed "s|$path||"

individual-shell-tools/ls/script-01.sh

@@ -13,3 +13,6 @@ fi
 
 # TODO: Write a command to list the files and folders in this directory.
 # The output should be a list of names including child-directory, script-01.sh, script-02.sh, and more.
+
+thisDir="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/ls"
+ls "$thisDir"

individual-shell-tools/ls/script-02.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command which lists all of the files in the directory named child-directory.
 # The output should be a list of names: helper-1.txt, helper-2.txt, helper-3.txt.
+thisDir="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/ls/child-directory"
+ls "$thisDir"

individual-shell-tools/ls/script-03.sh

@@ -5,3 +5,4 @@ set -euo pipefail
 # TODO: Write a command which _recursively_ lists all of the files and folders in this directory _and_ all of the files inside those folders.
 # The output should be a list of names including: child-directory, script-01.sh, helper-1.txt (and more).
 # The formatting of the output doesn't matter.
+find .

individual-shell-tools/ls/script-04.sh

@@ -15,9 +15,12 @@ echo "First exercise (sorted newest to oldest):"
 
 # TODO: Write a command which lists the files in the child-directory directory, one per line, sorted so that the most recently modified file is first.
 # The output should be a list of names in this order, one per line: helper-3.txt, helper-1.txt, helper-2.txt.
-
+thisDir="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/ls/child-directory"
+ls -1t "$thisDir"
 
 echo "Second exercise (sorted oldest to newest):"
 
 # TODO: Write a command which does the same as above, but sorted in the opposite order (oldest first).
 # The output should be a list of names in this order, one per line: helper-2.txt, helper-1.txt, helper-3.txt.
+thisDir="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/ls/child-directory"
+ls -1tr "$thisDir"

individual-shell-tools/sed/script-01.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # TODO: Write a command to output input.txt with all occurrences of the letter `i` replaced with `I`.
 # The output should contain 11 lines.
 # The first line of the output should be: "ThIs Is a sample fIle for experImentIng with sed.".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/sed/input.txt"
+sed 's/i/I/g' $path

individual-shell-tools/sed/script-02.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # TODO: Write a command to output input.txt with numbers removed.
 # The output should contain 11 lines.
 # Line 6 of the output should be " Alisha".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/sed/input.txt"
+sed "s/[0-9]//g" $path

individual-shell-tools/sed/script-03.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output input.txt removing any line which contains a number.
 # The output should contain 6 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/sed/input.txt"
+sed "/[0-9]/d" $path

individual-shell-tools/sed/script-04.sh

@@ -4,3 +4,7 @@ set -euo pipefail
 
 # TODO: Write a command to output input.txt replacing every occurrence of the string "We'll" with "We will".
 # The output should contain 11 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/sed/input.txt"
+old="We'll"
+new="We will"
+sed "s/$old/$new/g" $path

individual-shell-tools/sed/script-05.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # If a line starts with a number and a space, make the line instead end with a space and the number.
 # So line 6 which currently reads "37 Alisha" should instead read "Alisha 37".
 # The output should contain 11 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/sed/input.txt"
+sed -E 's/^([0-9]+) (.*)/\2 \1/' $path

individual-shell-tools/sed/script-06.sh

@@ -8,3 +8,5 @@ set -euo pipefail
 # The output should contain 11 lines.
 # Line 3 should be "It contains many lines, and there are some things you may want to do with each of them.".
 # Line 11 should be "We also should remember, when we go shopping, to get 4 items: oranges, cheese, bread, olives.".
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/sed/input.txt"
+sed -E 's/, ?/, /g' $path

individual-shell-tools/wc/script-01.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the number of words in the file helper-files/helper-3.txt.
 # The output should include the number 19. The output should not include the number 92.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files/helper-3.txt"
+wc -w "$path"

individual-shell-tools/wc/script-02.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the number of lines in the file helper-files/helper-3.txt.
 # The output should include the number 3. The output should not include the number 19.
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files/helper-3.txt"
+wc -l "$path"

individual-shell-tools/wc/script-03.sh

@@ -8,3 +8,5 @@ set -euo pipefail
 #        1       7      39 ../helper-files/helper-2.txt
 #        3      19      92 ../helper-files/helper-3.txt
 #        5      30     151 total
+path="/Users/cyf/Documents/SDC/Module-Tools/individual-shell-tools/helper-files"
+wc "$path"/*.txt

number-systems/README.md

@@ -5,61 +5,61 @@ Do not convert any binary numbers to decimal when solving a question unless the
 The goal of these exercises is for you to gain an intuition for binary numbers. Using tools to solve the problems defeats the point.
 
 Convert the decimal number 14 to binary.
-Answer:
+Answer:1110
 
 Convert the binary number 101101 to decimal:
-Answer:
+Answer:45
 
 Which is larger: 1000 or 0111?
-Answer:
+Answer:1000
 
 Which is larger: 00100 or 01011?
-Answer:
+Answer:01011
 
 What is 10101 + 01010?
-Answer:
+Answer:11111
 
 What is 10001 + 10001?
-Answer:
+Answer:100010
 
 What's the largest number you can store with 4 bits, if you want to be able to represent the number 0?
-Answer:
+Answer:15 or 0b1111
 
 How many bits would you need in order to store the numbers between 0 and 255 inclusive?
-Answer:
+Answer:8 bits (255 in base 2 is 0b11111111)
 
 How many bits would you need in order to store the numbers between 0 and 3 inclusive?
-Answer:
+Answer:2 bits (3 in base 2 is 0b11)
 
 How many bits would you need in order to store the numbers between 0 and 1000 inclusive?
-Answer:
+Answer:10 bits (1000 in base 2 is 0b1111101000)
 
 How can you test if a binary number is a power of two (e.g. 1, 2, 4, 8, 16, ...)?
-Answer:
+Answer:a binary number is a power of 2 if it has exactly one "1" bit in its representation.
 
 Convert the decimal number 14 to hex.
-Answer:
+Answer:E
 
 Convert the decimal number 386 to hex.
-Answer:
+Answer:182
 
 Convert the hex number 386 to decimal.
-Answer:
+Answer:902
 
 Convert the hex number B to decimal.
-Answer:
+Answer:11
 
 If reading the byte 0x21 as a number, what decimal number would it mean?
-Answer:
+Answer:33
 
 If reading the byte 0x21 as an ASCII character, what character would it mean?
-Answer:
+Answer:!
 
 If reading the byte 0x21 as a greyscale colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer:
+Answer:Dark shade of gray
 
 If reading the bytes 0xAA00FF as an RGB colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer:
+Answer:(RGB 170, 0, 255) high red, no green, maximum blue.
 
 If reading the bytes 0xAA00FF as a sequence of three one-byte decimal numbers, what decimal numbers would they be?
-Answer:
+Answer:170, 0, 255

shell-pipelines/ls-grep/script-01.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name contains at least one upper case letter.
 # Your output should contain 11 files.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/ls-grep/sample-files"
+ls $path | grep '[A-Z]'

shell-pipelines/ls-grep/script-02.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name starts with an upper case letter.
 # Your output should contain 10 files.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/ls-grep/sample-files"
+ls $path | grep '^[A-Z]'

shell-pipelines/ls-grep/script-03.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters.
 # Your output should contain 7 files.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/ls-grep/sample-files"
+ls $path | grep '^[A-Z][^A-Z]*$'

shell-pipelines/ls-grep/script-04.sh

@@ -4,3 +4,5 @@ set -euo pipefail
 
 # TODO: Write a command to count the number of files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters.
 # Your output should be the number 7.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/ls-grep/sample-files"
+ls $path | grep -c '^[A-Z][^A-Z]*$'

shell-pipelines/sort-uniq-head-tail/script-01.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the scores-table.txt file.
 # TODO: Write a command to output scores-table.txt, with lines sorted by the person's name.
 # The first line of your output should be "Ahmed London 1 10 4" (with no quotes). And the third line should be "Chandra Birmingham 12 6".
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/scores-table.txt"
+sort -t ' ' -k1 $path

shell-pipelines/sort-uniq-head-tail/script-02.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the scores-table.txt file.
 # TODO: Write a command to output scores-table.txt, with lines sorted by the person's first score, descending.
 # The first line of your output should be "Basia London 22 9 6" (with no quotes).
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/scores-table.txt"
+sort -t ' ' -k3 -n -r $path

shell-pipelines/sort-uniq-head-tail/script-03.sh

@@ -8,3 +8,5 @@ set -euo pipefail
 # Basia London 22 9 6
 # Piotr Glasgow 15 2 25 11 8
 # Chandra Birmingham 12 6
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/scores-table.txt"
+sort -t ' ' -k3 -n -r $path | head -n 3

shell-pipelines/sort-uniq-head-tail/script-04.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the scores-table.txt file.
 # TODO: Write a command to output scores-table.txt, with shows the line for the player whose first score was the second highest.
 # Your output should be: "Piotr Glasgow 15 2 25 11 8" (without quotes).
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/scores-table.txt"
+sort -t ' ' -k3 -n -r $path | awk 'NR==2'

shell-pipelines/sort-uniq-head-tail/script-05.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to show a list of all events that have happened, without duplication.
 # The order they're displayed doesn't matter, but we never want to see the same event listed twice.
 # Your output should contain 6 lines.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/events.txt"
+sort $path | uniq

shell-pipelines/sort-uniq-head-tail/script-06.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the events.txt file.
 # TODO: Write a command to show how many times anyone has entered and exited.
 # It should be clear from your script's output that there have been 5 Entry events and 4 Exit events.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/events.txt"
+grep -oE 'Entry|Exit' $path | sort | uniq -c

shell-pipelines/sort-uniq-head-tail/script-07.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to show how many times anyone has entered and exited.
 # It should be clear from your script's output that there have been 5 Entry events and 4 Exit events.
 # The word "Event" should not appear in your script's output.
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/sort-uniq-head-tail/events-with-timestamps.txt"
+grep -oE 'Entry|Exit' $path | sort | uniq -c

shell-pipelines/tr/script-01.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # The author got feedback that they're using too many exclamation marks (!).
 #
 # TODO: Write a command to output the contents of text.txt with every exclamation mark (!) replaced with a full-stop (.).
+path="/Users/cyf/Documents/SDC/Module-Tools/shell-pipelines/tr/text.txt"
+cat $path | tr '!' '.'