A pottery show command to read recent shards

src/pottery-show

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+#!/bin/bash
+set -e
+eval "$($(dirname $0)/pottery-config)"
+
+## usage: pottery show [COUNT]
+##
+## Displays the COUNT most recent entries recorded in the history.
+## 
+## If COUNT is not given, it defaults to 10.
+##
+## E.g. to show the 10 most recent entries
+##
+##     pottery show
+##
+## E.g. to show the 5 most recent entries
+##
+##     pottery show 5
+##
+
+count=${1:-10}
+rootdir=$("$pottery_bin_dir/_pottery_dir")
+
+for f in $(find $rootdir -type f -name '*.md' | sort --reverse --dictionary-order | head -n $count)
+do
+	f_name=$(basename $f)
+	f_date=${f_name:0:20}
+	echo $f_date
+	echo
+	cat $f
+	echo
+done

tests/shows-shards-newest-first.expected

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+pottery init
+TEST_TIME=1992-01-12T16:34:23Z pottery post "First post"
+docs/project-history/1992/1992-01/1992-01-12T16:34:23Z_post_FAKEUNIQUEID.md
+TEST_TIME=1992-01-12T17:00:00Z pottery post "Second post."
+docs/project-history/1992/1992-01/1992-01-12T17:00:00Z_post_FAKEUNIQUEID.md
+TEST_TIME=1992-01-13T16:34:23Z pottery post "It's a new day."
+docs/project-history/1992/1992-01/1992-01-13T16:34:23Z_post_FAKEUNIQUEID.md
+pottery show
+1992-01-13T16:34:23Z
+
+It's a new day.
+
+1992-01-12T17:00:00Z
+
+Second post.
+
+1992-01-12T16:34:23Z
+
+First post
+

tests/shows-shards-newest-first.sh

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+pottery init
+TEST_TIME=1992-01-12T16:34:23Z pottery post "First post"
+TEST_TIME=1992-01-12T17:00:00Z pottery post "Second post."
+TEST_TIME=1992-01-13T16:34:23Z pottery post "It's a new day."
+pottery show