CouchDB cleanup - remove old documents (shell method)

dbcleanup.sh

#!/bin/bash

# source: http://bravenewmethod.com/2012/05/31/couchdb-cleanup-script-for-purging-old-docs/
# but modified to get rid of node.js dependency

# if database needs auth:
# DBHOST=user:pass@hostname
DBHOST=localhost
PORT=5984

# Get key for entries that are over 1 month old.
# This assumes that created view can be queried using timestamps as keys.
if uname -a | grep -i darwin > /dev/null
then
    TODAY=$(date '+%Y-%m-%d')
    MONTHSAGO=$(date -v-1m '+%Y-%m-%d')
    MONTHSAGO_E=$(date -v-1m '+%s')
else
    TODAY=$(date '+%Y-%m-%d')
    MONTHSAGO=$(date -d '1 month ago' '+%Y-%m-%d')
    MONTHSAGO_E=$(date -d '1 month ago' '+%s')
fi

cleanup() {
    DATABASE=$1
    DESIGN=$2
    VIEW=$3

    echo "Cleaning $DATABASE/$DESIGN"
    curl --silent -S http://$DBHOST:$PORT/$DATABASE/_design/$DESIGN/_view/$VIEW?endkey=$MONTHSAGO_E | \
    awk 'BEGIN { FS=OFS=","; print "{\"docs\":["; } /"id"/ { gsub(/id/,"_id"); gsub(/value/,"_rev"); if(id) print id ", \"_deleted\":true, " rev ","; id = $1; rev = $3; } END { if (id) print id ", \"_deleted\":true, " rev; print "]}"; }' | \
    curl --silent -S -X POST -d @-  -H "Content-Type:application/json" http://$DBHOST:$PORT/$DATABASE/_bulk_docs | \
    sed 's/\({[^}]*}\),/\1=/g' | \
    tr "=" "\n" | tr -d '[]' | \
    wc -l | awk '{ print $1 " docs deleted" }'
    #grep -v "\"ok\":true"
}

echo "STATS CLEANUP <= $MONTHSAGO - Start" `date`

# Put databases and views here
cleanup mydb history outdated

echo "STATS CLEANUP - Done" `date`