Shell script to automatically clean TSD's cache directory from a cron job

clean_cache.sh

#!/bin/bash

CACHE_DIR=/tmp/tsd

diskSpaceIsShort() {
   df -h "$CACHE_DIR" \
   | awk 'NR==2{pct=$5; sub(/%/, "", pct); if (pct < 90) exit 1; exit 0;}'
}

if diskSpaceIsShort; then
  find "$CACHE_DIR" -type f -atime +7 | xargs --no-run-if-empty rm
  if diskSpaceIsShort; then
    rm -rf "$CACHE_DIR"/*
  fi
fi