From acb90114a05c0a139112b69fac25f8847bc48fa3 Mon Sep 17 00:00:00 2001 From: Pezhman-Azizi <80008463+Pezhman-Azizi@users.noreply.github.com> Date: Fri, 7 Mar 2025 10:15:00 +0000 Subject: [PATCH 1/4] Implement Bash scripts to process scores.json and person.json, extracting names, scores, cities, and performing calculations. --- jq/script-01.sh | 1 + jq/script-02.sh | 2 ++ jq/script-03.sh | 1 + jq/script-04.sh | 1 + jq/script-05.sh | 1 + jq/script-06.sh | 1 + jq/script-07.sh | 1 + jq/script-08.sh | 1 + jq/script-09.sh | 1 + jq/script-10.sh | 1 + jq/script-11.sh | 1 + 11 files changed, 12 insertions(+) diff --git a/jq/script-01.sh b/jq/script-01.sh index 95827f688..0d69705d1 100755 --- a/jq/script-01.sh +++ b/jq/script-01.sh @@ -5,3 +5,4 @@ set -euo pipefail # The input for this script is the person.json file. # TODO: Write a command to output the name of the person. # Your output should be exactly the string "Selma", but should not contain any quote characters. +jq -r '.name' person.json diff --git a/jq/script-02.sh b/jq/script-02.sh index 21544d67b..e7c322de1 100755 --- a/jq/script-02.sh +++ b/jq/script-02.sh @@ -5,3 +5,5 @@ set -euo pipefail # The input for this script is the person.json file. # TODO: Write a command to output the address of the person, all on one line, with a comma between each line. # Your output should be exactly the string "35 Fashion Street, London, E1 6PX", but should not contain any quote characters. +jq -r '.address | join(", ")' person.json + diff --git a/jq/script-03.sh b/jq/script-03.sh index 3566f03ba..d815788e2 100755 --- a/jq/script-03.sh +++ b/jq/script-03.sh @@ -5,3 +5,4 @@ set -euo pipefail # The input for this script is the person.json file. # TODO: Write a command to output the name of the person, then a comma, then their profession. # Your output should be exactly the string "Selma, Software Engineer", but should not contain any quote characters. +jq -r '[.name, .profession] | join(", ")' person.json diff --git a/jq/script-04.sh b/jq/script-04.sh index 015997e18..e50f742a4 100755 --- a/jq/script-04.sh +++ b/jq/script-04.sh @@ -6,3 +6,4 @@ set -euo pipefail # TODO: Write a command to output just the names of each player, one per line. # Your output should contain 6 lines, each with just one word on it. # Your output should not contain any quote characters. +jq -r '.[].name' scores.json diff --git a/jq/script-05.sh b/jq/script-05.sh index 993fc9ee3..ab78fbad4 100755 --- a/jq/script-05.sh +++ b/jq/script-05.sh @@ -5,3 +5,4 @@ set -euo pipefail # The input for this script is the scores.json file. # 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. +jq -r '.[] | "\(.name) \(.city)"' scores.json diff --git a/jq/script-06.sh b/jq/script-06.sh index 8b6e74c52..47fee35b5 100755 --- a/jq/script-06.sh +++ b/jq/script-06.sh @@ -6,3 +6,4 @@ 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" with no quotes. +jq -r '.[] | "\(.name) \(.scores[0])"' scores.json diff --git a/jq/script-07.sh b/jq/script-07.sh index d43f93d1b..f20ab3d7f 100755 --- a/jq/script-07.sh +++ b/jq/script-07.sh @@ -6,3 +6,4 @@ set -euo pipefail # TODO: Write a command to output just the names of each player along with the score from their last attempt. # Your output should contain 6 lines, each with one word and one number on it. # The first line should be "Ahmed 4" with no quotes. +jq -r '.[] | "\(.name) \(.scores[-1])"' scores.json diff --git a/jq/script-08.sh b/jq/script-08.sh index 6671fd1ba..165e67a4e 100755 --- a/jq/script-08.sh +++ b/jq/script-08.sh @@ -6,3 +6,4 @@ 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" with no quotes. +jq -r '.[] | "\(.name) \(.scores | length)"' scores.json diff --git a/jq/script-09.sh b/jq/script-09.sh index c2536a536..3ce4c2b71 100755 --- a/jq/script-09.sh +++ b/jq/script-09.sh @@ -6,3 +6,4 @@ set -euo pipefail # TODO: Write a command to output just the names of each player along with the total scores from all of their games added together. # Your output should contain 6 lines, each with one word and one number on it. # The first line should be "Ahmed 15" with no quotes. +jq -r '.[] | "\(.name) \(.scores | add)"' scores.json diff --git a/jq/script-10.sh b/jq/script-10.sh index 8e9d75f07..e1334079b 100755 --- a/jq/script-10.sh +++ b/jq/script-10.sh @@ -5,3 +5,4 @@ set -euo pipefail # The input for this script is the scores.json file. # TODO: Write a command to output the total of adding together all players' first scores. # Your output should be exactly the number 54. +jq '[.[].scores[0]] | add' scores.json diff --git a/jq/script-11.sh b/jq/script-11.sh index d2337a6b2..943b36a3f 100755 --- a/jq/script-11.sh +++ b/jq/script-11.sh @@ -5,3 +5,4 @@ set -euo pipefail # The input for this script is the scores.json file. # TODO: Write a command to output the total of adding together all scores from all games from all players. # Your output should be exactly the number 164. +jq '[.[].scores[]] | add' scores.json From 9fd22b2875ebd3a944cae34d57956cc02315a3cb Mon Sep 17 00:00:00 2001 From: Pezhman-Azizi <80008463+Pezhman-Azizi@users.noreply.github.com> Date: Fri, 7 Mar 2025 15:11:11 +0000 Subject: [PATCH 2/4] Enhanced shell pipeline exercises using ls, sort, uniq, head, tail, and tr for efficient text processing and command-line data manipulation. --- shell-pipelines/ls-grep/script-01.sh | 1 + shell-pipelines/ls-grep/script-02.sh | 1 + shell-pipelines/ls-grep/script-03.sh | 1 + shell-pipelines/ls-grep/script-04.sh | 1 + shell-pipelines/sort-uniq-head-tail/script-01.sh | 1 + shell-pipelines/sort-uniq-head-tail/script-02.sh | 1 + shell-pipelines/sort-uniq-head-tail/script-03.sh | 1 + shell-pipelines/sort-uniq-head-tail/script-04.sh | 1 + shell-pipelines/sort-uniq-head-tail/script-05.sh | 1 + shell-pipelines/sort-uniq-head-tail/script-06.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-07.sh | 1 + shell-pipelines/tr/script-01.sh | 1 + shell-pipelines/tr/script-02.sh | 1 + 13 files changed, 14 insertions(+) diff --git a/shell-pipelines/ls-grep/script-01.sh b/shell-pipelines/ls-grep/script-01.sh index 8c7d968a2..b77993b26 100755 --- a/shell-pipelines/ls-grep/script-01.sh +++ b/shell-pipelines/ls-grep/script-01.sh @@ -4,3 +4,4 @@ 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. +ls sample-files | grep '[A-Z]' diff --git a/shell-pipelines/ls-grep/script-02.sh b/shell-pipelines/ls-grep/script-02.sh index 16f5f71d9..4fa4206cd 100755 --- a/shell-pipelines/ls-grep/script-02.sh +++ b/shell-pipelines/ls-grep/script-02.sh @@ -4,3 +4,4 @@ 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. +ls sample-files | grep '^[A-Z]' diff --git a/shell-pipelines/ls-grep/script-03.sh b/shell-pipelines/ls-grep/script-03.sh index a302ab036..9b79f1c8c 100755 --- a/shell-pipelines/ls-grep/script-03.sh +++ b/shell-pipelines/ls-grep/script-03.sh @@ -4,3 +4,4 @@ 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. +ls sample-files | grep '^[A-Z][^A-Z]*$' diff --git a/shell-pipelines/ls-grep/script-04.sh b/shell-pipelines/ls-grep/script-04.sh index c000b7e3b..7ece87cdc 100755 --- a/shell-pipelines/ls-grep/script-04.sh +++ b/shell-pipelines/ls-grep/script-04.sh @@ -4,3 +4,4 @@ set -euo pipefail # TODO: Write a command to count the number of files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters. # Your output should be the number 7. +ls sample-files | grep -c '^[A-Z][^A-Z]*$' diff --git a/shell-pipelines/sort-uniq-head-tail/script-01.sh b/shell-pipelines/sort-uniq-head-tail/script-01.sh index 171e1f989..845ad89da 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-01.sh +++ b/shell-pipelines/sort-uniq-head-tail/script-01.sh @@ -5,3 +5,4 @@ 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". +sort scores-table.txt diff --git a/shell-pipelines/sort-uniq-head-tail/script-02.sh b/shell-pipelines/sort-uniq-head-tail/script-02.sh index 29c3c2524..e0281500d 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-02.sh +++ b/shell-pipelines/sort-uniq-head-tail/script-02.sh @@ -5,3 +5,4 @@ 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). +sort -k3,3nr scores-table.txt diff --git a/shell-pipelines/sort-uniq-head-tail/script-03.sh b/shell-pipelines/sort-uniq-head-tail/script-03.sh index bcbaf3420..01e6b4d0d 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-03.sh +++ b/shell-pipelines/sort-uniq-head-tail/script-03.sh @@ -8,3 +8,4 @@ set -euo pipefail # Basia London 22 9 6 # Piotr Glasgow 15 2 25 11 8 # Chandra Birmingham 12 6 +sort -k3,3nr scores-table.txt | head -n 3 diff --git a/shell-pipelines/sort-uniq-head-tail/script-04.sh b/shell-pipelines/sort-uniq-head-tail/script-04.sh index 65a5cfba8..a42bac984 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-04.sh +++ b/shell-pipelines/sort-uniq-head-tail/script-04.sh @@ -5,3 +5,4 @@ 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). +sort -k3,3nr scores-table.txt | sed -n '2p' diff --git a/shell-pipelines/sort-uniq-head-tail/script-05.sh b/shell-pipelines/sort-uniq-head-tail/script-05.sh index a93cd9f9d..8eba57e36 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-05.sh +++ b/shell-pipelines/sort-uniq-head-tail/script-05.sh @@ -6,3 +6,4 @@ 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. +sort events.txt | uniq diff --git a/shell-pipelines/sort-uniq-head-tail/script-06.sh b/shell-pipelines/sort-uniq-head-tail/script-06.sh index 715c7ae5c..1c628aa78 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-06.sh +++ b/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. + +grep -oE 'Entry|Exit' events.txt | sort | uniq -c diff --git a/shell-pipelines/sort-uniq-head-tail/script-07.sh b/shell-pipelines/sort-uniq-head-tail/script-07.sh index 7fd07e1ff..f65fed47e 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-07.sh +++ b/shell-pipelines/sort-uniq-head-tail/script-07.sh @@ -6,3 +6,4 @@ 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. +awk '{print $3}' events-with-timestamps.txt | grep -E 'Entry|Exit' | sort | uniq -c diff --git a/shell-pipelines/tr/script-01.sh b/shell-pipelines/tr/script-01.sh index 8bb0211e9..fe2acd5de 100755 --- a/shell-pipelines/tr/script-01.sh +++ b/shell-pipelines/tr/script-01.sh @@ -6,3 +6,4 @@ 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 (.). +sed 's/!/./g' text.txt diff --git a/shell-pipelines/tr/script-02.sh b/shell-pipelines/tr/script-02.sh index cf3a503a2..8598e779c 100755 --- a/shell-pipelines/tr/script-02.sh +++ b/shell-pipelines/tr/script-02.sh @@ -7,3 +7,4 @@ set -euo pipefail # so every Y should be a Z, and every Z should be a Y! # # TODO: Write a command to output the contents of text.txt with every Y and Z swapped (both upper and lower case). +tr 'yYzZ' 'zZyY' < text.txt From 76d0dfd129d23bb9a72fe35b0bb0dab1f516b269 Mon Sep 17 00:00:00 2001 From: Pezhman-Azizi <80008463+Pezhman-Azizi@users.noreply.github.com> Date: Wed, 17 Sep 2025 21:53:07 +0100 Subject: [PATCH 3/4] Added solutions for binary and hex/ASCII exercises --- number-systems/README.md | 48 ++++++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 21 deletions(-) diff --git a/number-systems/README.md b/number-systems/README.md index 77a3bde94..d33b21c9b 100644 --- a/number-systems/README.md +++ b/number-systems/README.md @@ -5,61 +5,67 @@ 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:32,8,4,1 = 45 Which is larger: 1000 or 0111? -Answer: +Answer: 1000 is larger since the left most digit is 1 compared to the other number. Which is larger: 00100 or 01011? -Answer: +Answer: 01011 is larger What is 10101 + 01010? -Answer: +Answer: 1111 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: + +Answer1: If representing 0 means having 0000 AS A POSSIBLE NUMBER in the range of 0 to largest number produced by four digits, then the largest possible number is when all the digits are one which makes 1111 the largest number. + +Answer2: If it means having 0 in one of the digits as a possible occurrence, then the largest possible number produced when zero goes to the last digit to have the least effect which 1110 the largest number. + How many bits would you need in order to store the numbers between 0 and 255 inclusive? -Answer: +Answer: since 256 is 2^8 the biggest number of digits with 255 inclusive is made when we have digits. How many bits would you need in order to store the numbers between 0 and 3 inclusive? -Answer: +Answer: 2 bits How many bits would you need in order to store the numbers between 0 and 1000 inclusive? -Answer: +Answer: 10 bits. since 2^n - 1 = the biggest number with n bits. How can you test if a binary number is a power of two (e.g. 1, 2, 4, 8, 16, ...)? -Answer: +Answer: only of it has only 1 bit as 1 and the rest are zeros Convert the decimal number 14 to hex. -Answer: +Answer: it is E Convert the decimal number 386 to hex. -Answer: +Answer: 281 Convert the hex number 386 to decimal. -Answer: +Answer:6*(16^0)+8*(16^1)+3*(16^2) = 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: 21hex = 2(16^1)+1(16^0) = 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: +If reading the byte 0x21 as a gray scale colour, as described in "Approaches for Representing Colors and Images", what color would it mean? +Answer: Since hex21 is 33 in decimal and we have a range of 0(black) to 255(white) in decimal, then 33 is relatively close to zero. So it the gray scale it a dark grey 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: Each set of 2 hex digits stands for each of primary colors in the following order: + +RRGGBB: comparing it to AA00FF means that we don't have any greens. so we would have a mixture of blue and red. So eventually we have shade of purpule 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 From fe6ffec63557f00137eaa724cbd52fee08b4f92c Mon Sep 17 00:00:00 2001 From: Pezhman-Azizi <80008463+Pezhman-Azizi@users.noreply.github.com> Date: Thu, 18 Sep 2025 15:13:56 +0100 Subject: [PATCH 4/4] Finish ls tool exercises --- individual-shell-tools/ls/script-01.sh | 1 + individual-shell-tools/ls/script-02.sh | 1 + individual-shell-tools/ls/script-03.sh | 1 + individual-shell-tools/ls/script-04.sh | 2 ++ 4 files changed, 5 insertions(+) diff --git a/individual-shell-tools/ls/script-01.sh b/individual-shell-tools/ls/script-01.sh index 241b62f5e..72f2fb4a6 100755 --- a/individual-shell-tools/ls/script-01.sh +++ b/individual-shell-tools/ls/script-01.sh @@ -13,3 +13,4 @@ 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. +ls diff --git a/individual-shell-tools/ls/script-02.sh b/individual-shell-tools/ls/script-02.sh index d0a5a10f4..d37175729 100755 --- a/individual-shell-tools/ls/script-02.sh +++ b/individual-shell-tools/ls/script-02.sh @@ -4,3 +4,4 @@ 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. +ls child-directory diff --git a/individual-shell-tools/ls/script-03.sh b/individual-shell-tools/ls/script-03.sh index 781216d21..8f0627b5f 100755 --- a/individual-shell-tools/ls/script-03.sh +++ b/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. +ls -R diff --git a/individual-shell-tools/ls/script-04.sh b/individual-shell-tools/ls/script-04.sh index 72f3817b3..ae225dc8a 100755 --- a/individual-shell-tools/ls/script-04.sh +++ b/individual-shell-tools/ls/script-04.sh @@ -16,8 +16,10 @@ 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. +ls -t1 ./child-directory 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. +ls -tr1 child-directory