Check that Squid is crashed and restart it.

squidcheck.sh

#!/bin/sh

Logger() { level="$1"; shift; logger -t "${0##*/}" -p "user.$level" -- "$@"; return 0; }

test  -f "/var/run/squid/squid.pid" || exit 0

pgrep -F "/var/run/squid/squid.pid" | grep -q '' &&
  Logger info "Squid OK" &&
  exit 0

Logger err "Squid seems dead, try to restart..."

/usr/local/etc/rc.d/squid restart

test  -f "/var/run/squid/squid.pid" &&
pgrep -F "/var/run/squid/squid.pid" | grep -q '' &&
  Logger notice "Squid restarted." ||
  Logger err    "Squid restart failed."

## END ##