Completed individual shell tools exercises

Hammad Haider · Hammad Haider · commit db8f5bbfea21 · 2026-04-11T04:24:33.000+02:00
diff --git a/individual-shell-tools/cat/script-01.sh b/individual-shell-tools/cat/script-01.sh
@@ -4,3 +4,6 @@ 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...".
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % cat helper-files/helper-1.txt
+Once upon a time...
diff --git a/individual-shell-tools/cat/script-02.sh b/individual-shell-tools/cat/script-02.sh
@@ -11,3 +11,10 @@ set -euo pipefail
 # It looked delicious.
 # I was tempted to take a bite of it.
 # But this seemed like a bad idea...
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % cat helper-files/*
+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...
diff --git a/individual-shell-tools/cat/script-03.sh b/individual-shell-tools/cat/script-03.sh
@@ -9,3 +9,8 @@ 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...
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % cat -n helper-files/helper-3.txt
+     1  It looked delicious.
+     2  I was tempted to take a bite of it.
+     3  But this seemed like a bad idea...
diff --git a/individual-shell-tools/cat/script-04-stretch.sh b/individual-shell-tools/cat/script-04-stretch.sh
@@ -13,3 +13,10 @@ 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...
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % cat helper-files/* | nl
+     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...
diff --git a/individual-shell-tools/grep/script-01.sh b/individual-shell-tools/grep/script-01.sh
@@ -4,3 +4,11 @@ set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt said by the Doctor.
 # The output should contain 6 lines.
+
+hammadhaider@Hammads-MacBook-Pro grep % grep "^Doctor" dialogue.txt
+Doctor: Hello
+Doctor: What's wrong today?
+Doctor: That sounds frustrating. When did this start?
+Doctor: Say "Hi".
+Doctor: You didn't say hello
+Doctor: You're welcome, goodbye
diff --git a/individual-shell-tools/grep/script-02.sh b/individual-shell-tools/grep/script-02.sh
@@ -4,3 +4,14 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro grep % grep -i "doctor" dialogue.txt
+Doctor: Hello
+Patient: Hello Doctor
+Doctor: What's wrong today?
+Doctor: That sounds frustrating. When did this start?
+Doctor: Say "Hi".
+Doctor: You didn't say hello
+Doctor: You're welcome, goodbye
+Patient: I went to the doctor!
+Spouse: I'm glad you saw the Doctor: did they cure you?
diff --git a/individual-shell-tools/grep/script-03.sh b/individual-shell-tools/grep/script-03.sh
@@ -4,3 +4,6 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro grep % grep -i "doctor" dialogue.txt | wc -l
+       9
diff --git a/individual-shell-tools/grep/script-04.sh b/individual-shell-tools/grep/script-04.sh
@@ -4,3 +4,15 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro grep % grep -vi "hello" dialogue.txt
+Doctor: What's wrong today?
+Doctor: That sounds frustrating. When did this start?
+Doctor: Say "Hi".
+Patient: Hi
+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!
diff --git a/individual-shell-tools/grep/script-05.sh b/individual-shell-tools/grep/script-05.sh
@@ -4,3 +4,10 @@ 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).
+
+hammadhaider@Hammads-MacBook-Pro grep % grep -B 1 "cure" dialogue.txt
+Doctor: You didn't say hello
+Patient: I seem to be cured!
+--
+Patient: I went to the doctor!
+Spouse: I'm glad you saw the Doctor: did they cure you?
diff --git a/individual-shell-tools/grep/script-06.sh b/individual-shell-tools/grep/script-06.sh
@@ -4,3 +4,7 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro grep % grep -l "Doctor" *.txt
+dialogue-2.txt
+dialogue.txt
diff --git a/individual-shell-tools/grep/script-07.sh b/individual-shell-tools/grep/script-07.sh
@@ -4,3 +4,8 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro grep % grep -c "Doctor" *.txt
+dialogue-2.txt:3
+dialogue-3.txt:0
+dialogue.txt:8
diff --git a/individual-shell-tools/ls/script-01.sh b/individual-shell-tools/ls/script-01.sh
@@ -13,3 +13,36 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % ls -R
+awk             grep            ls              sed
+cat             helper-files    README.md       wc
+
+./awk:
+README.md               script-02.sh            script-05.sh
+scores-table.txt        script-03.sh            script-06-stretch.sh
+script-01.sh            script-04.sh            script-07-stretch.sh
+
+./cat:
+script-01.sh            script-03.sh
+script-02.sh            script-04-stretch.sh
+
+./grep:
+dialogue-2.txt  dialogue.txt    script-02.sh    script-04.sh    script-06.sh
+dialogue-3.txt  script-01.sh    script-03.sh    script-05.sh    script-07.sh
+
+./helper-files:
+helper-1.txt    helper-2.txt    helper-3.txt
+
+./ls:
+child-directory script-01.sh    script-02.sh    script-03.sh    script-04.sh
+
+./ls/child-directory:
+helper-1.txt    helper-2.txt    helper-3.txt
+
+./sed:
+input.txt       script-02.sh    script-04.sh    script-06.sh
+script-01.sh    script-03.sh    script-05.sh
+
+./wc:
+script-01.sh    script-02.sh    script-03.sh
diff --git a/individual-shell-tools/ls/script-02.sh b/individual-shell-tools/ls/script-02.sh
@@ -4,3 +4,8 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro ls % ls -1 ./child-directory
+helper-1.txt
+helper-2.txt
+helper-3.txt
diff --git a/individual-shell-tools/ls/script-03.sh b/individual-shell-tools/ls/script-03.sh
@@ -5,3 +5,15 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro ls % ls -1 -R
+child-directory
+script-01.sh
+script-02.sh
+script-03.sh
+script-04.sh
+
+./child-directory:
+helper-1.txt
+helper-2.txt
+helper-3.txt
diff --git a/individual-shell-tools/ls/script-04.sh b/individual-shell-tools/ls/script-04.sh
@@ -16,8 +16,17 @@ 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.
 
+hammadhaider@Hammads-MacBook-Pro ls % ls -1 -t child-directory 
+helper-3.txt
+helper-2.txt
+helper-1.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.
+
+hammadhaider@Hammads-MacBook-Pro ls % ls -1 -tr child-directory
+helper-1.txt
+helper-2.txt
+helper-3.txt
diff --git a/individual-shell-tools/sed/script-01.sh b/individual-shell-tools/sed/script-01.sh
@@ -5,3 +5,17 @@ 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.".
+
+hammadhaider@Hammads-MacBook-Pro sed % sed 's/i/I/g' input.txt   
+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.
+hammadhaider@Hammads-MacBook-Pro sed % 
diff --git a/individual-shell-tools/sed/script-02.sh b/individual-shell-tools/sed/script-02.sh
@@ -5,3 +5,16 @@ 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".
+
+hammadhaider@Hammads-MacBook-Pro sed % sed 's/[0-9]//g' input.txt
+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:
+ Alisha
+ Jacob
+ Pietro
+ Katya
+
+We also should remember, when we go shopping, to get  items: oranges,cheese,bread,olives.
diff --git a/individual-shell-tools/sed/script-03.sh b/individual-shell-tools/sed/script-03.sh
@@ -4,3 +4,19 @@ set -euo pipefail
 
 # TODO: Write a command to output input.txt removing any line which contains a number.
 # The output should contain 6 lines.
+
+hammadhaider@Hammads-MacBook-Pro sed % sed '/[0-9]/d' input.txt
+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:
+
+Alternative with grep
+
+hammadhaider@Hammads-MacBook-Pro sed % grep -v '[0-9]' input.txt
+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:
diff --git a/individual-shell-tools/sed/script-04.sh b/individual-shell-tools/sed/script-04.sh
@@ -4,3 +4,16 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro sed % sed "s/We'll/We will/g" input.txt
+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 will 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.
diff --git a/individual-shell-tools/sed/script-05.sh b/individual-shell-tools/sed/script-05.sh
@@ -6,3 +6,32 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro sed % sed 's/^\([0-9][0-9]*\) \(.*\)$/\2 \1/' input.txt
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+Alisha 37
+Jacob 15
+Pietro 7
+Katya 3
+
+We also should remember, when we go shopping, to get 4 items: oranges,cheese,bread,olives.
+
+Alternative -E
+
+hammadhaider@Hammads-MacBook-Pro sed % sed -E 's/^([0-9]+) (.*)$/\2 \1/' input.txt
+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:
+Alisha 37
+Jacob 15
+Pietro 7
+Katya 3
+
+We also should remember, when we go shopping, to get 4 items: oranges,cheese,bread,olives.
+hammadhaider@Hammads-MacBo
diff --git a/individual-shell-tools/sed/script-06.sh b/individual-shell-tools/sed/script-06.sh
@@ -8,3 +8,32 @@ 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.".
+
+hammadhaider@Hammads-MacBook-Pro sed % sed 's/,\([^ ]\)/, \1/g' input.txt
+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.
+hammadhaider@Hammads-MacBook-Pro sed
+
+Alternative
+
+hammadhaider@Hammads-MacBook-Pro sed % sed 's/,\([^[:space:]]\)/, \1/g' input.txt
+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.
diff --git a/individual-shell-tools/wc/script-01.sh b/individual-shell-tools/wc/script-01.sh
@@ -4,3 +4,6 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % wc -w helper-files/helper-3.txt
+      19 helper-files/helper-3.txt
diff --git a/individual-shell-tools/wc/script-02.sh b/individual-shell-tools/wc/script-02.sh
@@ -4,3 +4,6 @@ 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.
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % wc -l helper-files/helper-3.txt
+       3 helper-files/helper-3.txt
diff --git a/individual-shell-tools/wc/script-03.sh b/individual-shell-tools/wc/script-03.sh
@@ -8,3 +8,9 @@ set -euo pipefail
 #        1       7      39 ../helper-files/helper-2.txt
 #        3      19      92 ../helper-files/helper-3.txt
 #        5      30     151 total
+
+hammadhaider@Hammads-MacBook-Pro individual-shell-tools % wc helper-files/*
+       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
