Add exercises for individual shell tools and shell pipelines

individual-shell-tools/README.md

@@ -0,0 +1,24 @@
+# Individual shell tools exercises
+
+This folder contains exercises to help you get to know individual shell tools.
+
+Each folder is named after one tool, and contains exercises to practice using it.
+
+Each folder contains a number of scripts named `script-??.sh` as well as some files that are used by the scripts. You should look in the scripts one at a time and understand what you need to fix.
+
+When a script is complete, move on to the next script.
+
+When a folder is complete, move on to the next folder.
+
+Before running a script you should `cd` into the directory it's in.
+You should write all of your scripts assuming they're running inside the directory they're saved in.
+
+Some folders contain a README.md explaining more information, others do not.
+
+We recommend approaching the tools in this order:
+1. `ls`
+2. `cat`
+3. `wc`
+4. `grep`
+5. `sed`
+6. `awk`

individual-shell-tools/awk/README.md

@@ -0,0 +1,9 @@
+scores-table.txt contains structured information.
+
+Each line contains information about one player in a game.
+On each line, first is the player's name.
+Then the city they're in.
+Then a variable number of scores - one for each time they've played the game.
+Each entry on a line is separated by a single space character.
+
+All exercises in this directory operate on the data in scores-table.txt.

individual-shell-tools/awk/scores-table.txt

@@ -0,0 +1,6 @@
+Ahmed London 1 10 4
+Basia London 22 9 6
+Mehmet Birmingham 3 12 17
+Leila London 1
+Piotr Glasgow 15 2 25 11 8
+Chandra Birmingham 12 6

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+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".

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

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+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".

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

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+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".

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

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# NOTE: This is a stretch exercise - it is optional.
+
+# TODO: Write a command to output the total of adding together all players' first scores.
+# Your output should be exactly the number 54.

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

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# NOTE: This is a stretch exercise - it is optional.
+
+# 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"

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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...".

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

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output the contents of all of the files inside the helper-files directory to the terminal.
+# Make sure you are only calling `cat` once.
+#
+# The output of this command should be:
+# Once upon a time...
+# There was a house made of gingerbread.
+# It looked delicious.
+# I was tempted to take a bite of it.
+# But this seemed like a bad idea...

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

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output the contents of the file `helper-3.txt` inside the helper-files directory to the terminal.
+# This time, we also want to see the line numbers in the output.
+#
+# The output of this command should be something like:
+# 1 It looked delicious.
+# 2 I was tempted to take a bite of it.
+# 3 But this seemed like a bad idea...

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

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# NOTE: This is a stretch exercise - it is optional.
+
+# TODO: Write a command to output the contents of all of the files in the helper-files directory to the terminal.
+# We also want to see the line numbers in the output, but we want line numbers not to reset at the start of each file.
+#
+# The output of this command should be something like:
+# 1 Once upon a time...
+# 2 There was a house made of gingerbread.
+# 3 It looked delicious.
+# 4 I was tempted to take a bite of it.
+# 5 But this seemed like a bad idea...

individual-shell-tools/grep/dialogue-2.txt

@@ -0,0 +1,4 @@
+Doctor: Hello
+Patient: Hello Doctor
+Patient: Thank you so much for your help last week
+Doctor: No problem!

individual-shell-tools/grep/dialogue-3.txt

@@ -0,0 +1,3 @@
+Patient: That doctor is so nice!
+Spouse: I'm glad he could help.
+Patient: Me too!

individual-shell-tools/grep/dialogue.txt

@@ -0,0 +1,15 @@
+Doctor: Hello
+Patient: Hello Doctor
+Doctor: What's wrong today?
+Patient: Hello, I can't stop saying hello
+Doctor: That sounds frustrating. When did this start?
+Patient: Hello, about two days ago.
+Doctor: Say "Hi".
+Patient: Hi
+Doctor: You didn't say hello
+Patient: I seem to be cured!
+Doctor: You're welcome, goodbye
+
+Patient: I went to the doctor!
+Spouse: I'm glad you saw the Doctor: did they cure you?
+Patient: Yes!

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output every line in dialogue.txt said by the Doctor.
+# The output should contain 6 lines.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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).

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

individual-shell-tools/helper-files/helper-1.txt

@@ -0,0 +1 @@
+Once upon a time...

individual-shell-tools/helper-files/helper-2.txt

@@ -0,0 +1 @@
+There was a house made of gingerbread.

individual-shell-tools/helper-files/helper-3.txt

@@ -0,0 +1,3 @@
+It looked delicious.
+I was tempted to take a bite of it.
+But this seemed like a bad idea...

individual-shell-tools/ls/child-directory/helper-1.txt

@@ -0,0 +1 @@
+Once upon a time...

individual-shell-tools/ls/child-directory/helper-2.txt

@@ -0,0 +1 @@
+There was a house made of gingerbread.

individual-shell-tools/ls/child-directory/helper-3.txt

@@ -0,0 +1,3 @@
+It looked delicious.
+I was tempted to take a bite of it.
+But this seemed like a bad idea...

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

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# Do not change this part of the script - only change after the TODO comment.
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)"
+if [[ "${script_dir}" != "$(pwd)" ]]; then
+  echo >&2 "ERROR: You haven't cd'd into the correct directory."
+  echo >&2 "For each exercise, you should cd to the directory containing the script before running it."
+  exit 1
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# Do not change this part of the script - only change after the TODO comment.
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)"
+touch "${script_dir}/child-directory/helper-2.txt"
+sleep 1
+touch "${script_dir}/child-directory/helper-1.txt"
+sleep 1
+touch "${script_dir}/child-directory/helper-3.txt"
+
+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.
+
+
+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.

individual-shell-tools/sed/input.txt

@@ -0,0 +1,11 @@
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+37 Alisha
+15 Jacob
+7 Pietro
+3 Katya
+
+We also should remember, when we go shopping, to get 4 items: oranges,cheese,bread,olives.

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

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output input.txt with all occurrences of the letter `s` replaced with `S`.
+# The output should contain 11 lines.
+# The first line of the output should be: "ThiS iS a Sample file for experimenting with Sed.".

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

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+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".

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output input.txt removing any line which contains a number.
+# The output should contain 6 lines.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output input.txt with one change:
+# 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.

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

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output input.txt with one fix:
+# If a comma in input.txt is not followed by a space, add a space after.
+# If there is already a space after a comma, do not add an additional space.
+# 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.".

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+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.

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

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output the number of lines, words, and characters in all of the files inside the helper-files directory.
+# The output should be something like:
+#        1       4      20 ../helper-files/helper-1.txt
+#        1       7      39 ../helper-files/helper-2.txt
+#        3      19      92 ../helper-files/helper-3.txt
+#        5      30     151 total