1 files changed, 21 insertions, 0 deletions
diff --git a/rollingavg b/rollingavg
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+#!/usr/bin/env bash
+#
+# calculates rolling average for numbers via stdin
+#
+# here's an example with hledger:
+#
+# hledger bal ^in cur:USD -MA --end=thismonth --output-format=csv \
+#   | tail -n 1 \
+#   | cut -d',' -f 2- \
+#   | tr -d '" USD-' \
+#   | tr ',' '\n' \
+#   | rollingavg
+n=0
+total=0
+declare -i n
+while read i
+do
+    n+=1
+    total=$(bc -l <<< "$total + $i")
+    printf "%.2f\n"  $(bc -l <<< "$total / $n")
+done