From 47ac52348ff3cce550cbe16e211b3de886063879 Mon Sep 17 00:00:00 2001 From: iswat Date: Mon, 23 Mar 2026 13:07:25 +0000 Subject: [PATCH 1/3] Add scripts to filter and count files by uppercase letter patterns - script-01.sh: List files with at least one uppercase letter in the name. - script-02.sh: List files whose names start with an uppercase letter. - script-03.sh: List files whose names start with an uppercase letter and have no other uppercase letters. - script-04.sh: Count files matching the pattern from script-03.sh. --- shell-pipelines/ls-grep/script-01.sh | 2 ++ shell-pipelines/ls-grep/script-02.sh | 2 ++ shell-pipelines/ls-grep/script-03.sh | 2 ++ shell-pipelines/ls-grep/script-04.sh | 2 ++ 4 files changed, 8 insertions(+) diff --git a/shell-pipelines/ls-grep/script-01.sh b/shell-pipelines/ls-grep/script-01.sh index 8c7d968a2..801f8cde0 100755 --- a/shell-pipelines/ls-grep/script-01.sh +++ b/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. + +ls ./sample-files | grep '[A-Z]' \ No newline at end of file diff --git a/shell-pipelines/ls-grep/script-02.sh b/shell-pipelines/ls-grep/script-02.sh index 16f5f71d9..1cb8c35f5 100755 --- a/shell-pipelines/ls-grep/script-02.sh +++ b/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. + +ls ./sample-files | grep '^[A-Z]' \ No newline at end of file diff --git a/shell-pipelines/ls-grep/script-03.sh b/shell-pipelines/ls-grep/script-03.sh index a302ab036..44794a90f 100755 --- a/shell-pipelines/ls-grep/script-03.sh +++ b/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. + +ls ./sample-files | grep '^[A-Z][^A-Z]*$' \ No newline at end of file diff --git a/shell-pipelines/ls-grep/script-04.sh b/shell-pipelines/ls-grep/script-04.sh index c000b7e3b..c27e7d658 100755 --- a/shell-pipelines/ls-grep/script-04.sh +++ b/shell-pipelines/ls-grep/script-04.sh @@ -4,3 +4,5 @@ set -euo pipefail # TODO: Write a command to count the number of files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters. # Your output should be the number 7. + +ls ./sample-files | grep -c '^[A-Z][^A-Z]*$' \ No newline at end of file From b655cd487f61475fd94cc8723b56c9b41f507cbc Mon Sep 17 00:00:00 2001 From: iswat Date: Mon, 23 Mar 2026 14:32:56 +0000 Subject: [PATCH 2/3] Add solutions for sort/uniq/head/tail exercises - script-01.sh: sort scores-table.txt by name. - script-02.sh: sort scores-table.txt by first score (numeric, descending). - script-03.sh: show top 3 players by first score. - script-04.sh: show the player with the second highest first score. - script-05.sh: list unique events from events.txt. - script-06.sh: count Entry/Exit occurrences in events.txt. - script-07.sh: count Entry/Exit occurrences in events-with-timestamps.txt (skip header, sort by Event column, count Event values). --- shell-pipelines/sort-uniq-head-tail/script-01.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-02.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-03.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-04.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-05.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-06.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-07.sh | 2 ++ 7 files changed, 14 insertions(+) diff --git a/shell-pipelines/sort-uniq-head-tail/script-01.sh b/shell-pipelines/sort-uniq-head-tail/script-01.sh index 171e1f989..34ba01523 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-01.sh +++ b/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". + +sort ./scores-table.txt \ No newline at end of file diff --git a/shell-pipelines/sort-uniq-head-tail/script-02.sh b/shell-pipelines/sort-uniq-head-tail/script-02.sh index 29c3c2524..8c9f33324 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-02.sh +++ b/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). + +sort -k3 -nr ./scores-table.txt \ No newline at end of file diff --git a/shell-pipelines/sort-uniq-head-tail/script-03.sh b/shell-pipelines/sort-uniq-head-tail/script-03.sh index bcbaf3420..e97578f3c 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-03.sh +++ b/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 + +sort -k3 -nr ./scores-table.txt | head -3 \ No newline at end of file diff --git a/shell-pipelines/sort-uniq-head-tail/script-04.sh b/shell-pipelines/sort-uniq-head-tail/script-04.sh index 65a5cfba8..13955a805 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-04.sh +++ b/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). + +sort -k3 -nr ./scores-table.txt | head -2 | tail -1 \ No newline at end of file diff --git a/shell-pipelines/sort-uniq-head-tail/script-05.sh b/shell-pipelines/sort-uniq-head-tail/script-05.sh index a93cd9f9d..f586c03b0 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-05.sh +++ b/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. + +sort ./events.txt | uniq \ No newline at end of file diff --git a/shell-pipelines/sort-uniq-head-tail/script-06.sh b/shell-pipelines/sort-uniq-head-tail/script-06.sh index 715c7ae5c..3999bf9e0 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. + +sort ./events.txt | uniq -c -w5 \ No newline at end of file diff --git a/shell-pipelines/sort-uniq-head-tail/script-07.sh b/shell-pipelines/sort-uniq-head-tail/script-07.sh index 7fd07e1ff..3ca1891bd 100755 --- a/shell-pipelines/sort-uniq-head-tail/script-07.sh +++ b/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. + +tail -n +2 ./events-with-timestamps.txt | sort -k3,3 | uniq -c -f2 -w5 \ No newline at end of file From dd19aa775a666e90f941027728c8897e9dd8aee9 Mon Sep 17 00:00:00 2001 From: iswat Date: Mon, 23 Mar 2026 14:45:00 +0000 Subject: [PATCH 3/3] Add tr transformations for text exercises - script-01.sh: replace all '!' with '.' using tr. - script-02.sh: swap Y and Z (both upper and lower case) using tr. --- shell-pipelines/tr/script-01.sh | 2 ++ shell-pipelines/tr/script-02.sh | 2 ++ 2 files changed, 4 insertions(+) diff --git a/shell-pipelines/tr/script-01.sh b/shell-pipelines/tr/script-01.sh index 8bb0211e9..acf541620 100755 --- a/shell-pipelines/tr/script-01.sh +++ b/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 (.). + +tr '!' '.' < ./text.txt \ No newline at end of file diff --git a/shell-pipelines/tr/script-02.sh b/shell-pipelines/tr/script-02.sh index cf3a503a2..8a51b0bab 100755 --- a/shell-pipelines/tr/script-02.sh +++ b/shell-pipelines/tr/script-02.sh @@ -7,3 +7,5 @@ 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 'YZyz' 'ZYzy' < ./text.txt \ No newline at end of file