seed: curriculum content

1.solar-system/1.welcome/09.the-scripter/index.md

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+---
+type: challenge
+title: "The Scripter"
+xp: 100
+duration: 35
+difficulty: 3
+---
+
+# The Scripter
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, time to combine commands. Bash lets you embed the output of
+> one command inside another using `$(...)` — *command substitution*:
+>
+> ```bash
+> echo "Today is $(date '+%Y-%m-%d')"
+> # → Today is 2026-05-04
+> ```
+>
+> When your script runs, a directory `supplies/` exists with several
+> files. Produce `report.txt` containing exactly two lines:
+>
+> ```
+> Date: <today in YYYY-MM-DD format>
+> Files in supplies: <count of entries in supplies/>
+> ```
+>
+> Two helpers:
+>
+> - `date '+%Y-%m-%d'` — today in the right format
+> - `ls supplies | wc -l | tr -d ' '` — entry count, whitespace stripped
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+In `starter/starter.sh`, use `echo` + `$(...)` substitution to
+produce the two-line report.
+
+## Objectives
+
+- `report.txt` exists
+- Line 1 matches `Date: <today>`
+- Line 2 matches `Files in supplies: <count>`

1.solar-system/1.welcome/09.the-scripter/starter/starter.sh

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+#!/bin/bash
+# The Scripter — combine commands into a script.
+#
+# When this script runs, a directory `supplies/` exists with several
+# files. Your script must produce `report.txt` containing exactly two
+# lines:
+#
+#   Date: <today, in YYYY-MM-DD format>
+#   Files in supplies: <number of entries in supplies/>
+#
+# Use command substitution `$(...)` to embed command output inside
+# strings:
+#
+#   $(date '+%Y-%m-%d')
+#   $(ls supplies | wc -l | tr -d ' ')
+
+# Your code here.

1.solar-system/1.welcome/09.the-scripter/testing/test.sh

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+#!/bin/bash
+mkdir -p supplies
+touch supplies/oxygen-tank.txt \
+      supplies/ration-pack.txt \
+      supplies/medkit.txt \
+      supplies/repair-kit.txt \
+      supplies/comms-unit.txt
+
+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 report.txt ]; report $? "report.txt exists"
+
+TODAY=$(date '+%Y-%m-%d')
+LINE1=$(sed -n '1p' report.txt 2>/dev/null)
+LINE2=$(sed -n '2p' report.txt 2>/dev/null)
+
+[ "$LINE1" = "Date: $TODAY" ]; report $? "line 1 is 'Date: $TODAY'"
+[ "$LINE2" = "Files in supplies: 5" ]; report $? "line 2 is 'Files in supplies: 5'"