From c35e38e37b982606e89df286caccaed30c4ed67c Mon Sep 17 00:00:00 2001 From: Craig D'Silva Date: Fri, 20 Mar 2026 11:23:46 +0000 Subject: [PATCH 1/4] ls-grep --- 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..9897e717e 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..723012931 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..790b0a517 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]' | grep -vE '.[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..4bbe04834 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 '^[A-Z]' | grep -vE '.[A-Z]' | wc -l \ No newline at end of file From ea8290b806aa16778bbf2b343f8fbe82ca064ff7 Mon Sep 17 00:00:00 2001 From: Craig D'Silva Date: Fri, 20 Mar 2026 13:44:26 +0000 Subject: [PATCH 2/4] sort-uniq-head-tail --- 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 ++ 5 files changed, 10 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..454bf592b 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..32bd99c4e 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 -n -r 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..d9e70bce9 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 -n -r scores-table.txt | head -n 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..2da347219 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 -n -r scores-table.txt | head -n 2 | tail -n 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..a28e754ba 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. + +cat events.txt | sort | uniq \ No newline at end of file From 8f21fbc23d2e86a5d2c8ca7d96fbf693ca56f8f1 Mon Sep 17 00:00:00 2001 From: Craig D'Silva Date: Fri, 20 Mar 2026 14:06:39 +0000 Subject: [PATCH 3/4] 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..c7287f074 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 (.). + +cat text.txt | tr '!' '.' \ No newline at end of file diff --git a/shell-pipelines/tr/script-02.sh b/shell-pipelines/tr/script-02.sh index cf3a503a2..fc362333d 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). + +cat text.txt | tr 'YZyz' 'ZYzy' \ No newline at end of file From adba6e5f3a8aa9d6f5b31a84adf9f2ffeac22edf Mon Sep 17 00:00:00 2001 From: Craig D'Silva Date: Sat, 21 Mar 2026 22:02:58 +0000 Subject: [PATCH 4/4] Complete script 6 & 7 of sort-uniq-head-tail --- shell-pipelines/sort-uniq-head-tail/script-06.sh | 2 ++ shell-pipelines/sort-uniq-head-tail/script-07.sh | 2 ++ 2 files changed, 4 insertions(+) diff --git a/shell-pipelines/sort-uniq-head-tail/script-06.sh b/shell-pipelines/sort-uniq-head-tail/script-06.sh index 715c7ae5c..08f585fec 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. + +cat events.txt | sort | uniq -c \ 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..2a3b2a2a9 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. + +cat events-with-timestamps.txt | awk '{print $3, $4;}' | grep -v 'Event' | sort | uniq -c \ No newline at end of file