seed: curriculum content

1.solar-system/1.welcome/06.the-reader/index.md

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+---
+type: challenge
+title: "The Reader"
+xp: 50
+duration: 30
+difficulty: 2
+---
+
+# The Reader
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, an old mission log was recovered. We need three things from it.
+>
+> When your script runs, `mission-log.txt` is sitting in the working
+> directory. Pull these out:
+>
+> 1. The first 5 lines → save to `first-five.txt`
+> 2. The last 3 lines → save to `last-three.txt`
+> 3. The total line count → save to `line-count.txt`
+>
+> Three commands:
+>
+> - `head -n N file` — first N lines
+> - `tail -n N file` — last N lines
+> - `wc -l file` — count lines
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+In `starter/starter.sh`, produce the three output files using `head`,
+`tail`, `wc`, and redirect.
+
+## Objectives
+
+- `first-five.txt` matches the first 5 lines of the log
+- `last-three.txt` matches the last 3 lines of the log
+- `line-count.txt` contains the line count

1.solar-system/1.welcome/06.the-reader/starter/starter.sh

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+#!/bin/bash
+# The Reader — pull stats from a log.
+#
+# When this script runs, mission-log.txt is in your working directory.
+# Your script must produce three files:
+#
+#   - first-five.txt — the first 5 lines of mission-log.txt
+#   - last-three.txt — the last 3 lines of mission-log.txt
+#   - line-count.txt — the line count (output of `wc -l`)
+#
+# Tools: head, tail, wc, redirect (>)
+
+# Your code here.

1.solar-system/1.welcome/06.the-reader/testing/test.sh

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+#!/bin/bash
+cat > mission-log.txt <<'LOG'
+[1969-07-20 13:32] Apollo touchdown confirmed.
+[1969-07-20 13:33] Surface stable.
+[1969-07-20 13:34] Cabin sealed.
+[1969-07-20 13:35] EVA prep started.
+[1969-07-20 13:40] Hatch open check.
+[1969-07-20 13:42] Suit pressurization complete.
+[1969-07-20 13:50] Ladder deployed.
+[1969-07-20 13:55] First step recorded.
+[1969-07-20 14:00] Sample collection begun.
+[1969-07-20 14:10] All systems nominal.
+[1969-07-20 14:20] Communication test passed.
+[1969-07-20 14:30] Second sample box sealed.
+[1969-07-20 14:40] Solar panel deployed.
+[1969-07-20 14:50] Flag planted.
+[1969-07-20 15:00] Phone call inbound.
+[1969-07-20 15:10] Phone call complete.
+[1969-07-20 15:20] Sample box stowed.
+[1969-07-20 15:30] EVA wrap-up started.
+[1969-07-20 15:35] Hatch closed.
+[1969-07-20 15:40] Cabin re-pressurized.
+LOG
+
+bash solution.sh > /dev/null 2>&1
+
+N=0
+report() {
+  N=$((N+1))
+  if [ "$1" = "0" ]; then echo "ok $N - $2"; else echo "not ok $N - $2"; fi
+}
+
+[ -f first-five.txt ]; report $? "first-five.txt exists"
+diff -q <(head -n 5 mission-log.txt) first-five.txt > /dev/null 2>&1; report $? "first-five.txt matches head -n 5"
+[ -f last-three.txt ]; report $? "last-three.txt exists"
+diff -q <(tail -n 3 mission-log.txt) last-three.txt > /dev/null 2>&1; report $? "last-three.txt matches tail -n 3"
+[ -f line-count.txt ]; report $? "line-count.txt exists"
+COUNT=$(awk '{print $1}' line-count.txt 2>/dev/null | tr -d ' ')
+[ "$COUNT" = "20" ]; report $? "line-count.txt contains 20"