Mongos script file for RedHat/CentOS, if you change a few this script you can adapt for your needs

mongos

#!/bin/bash

# mongos - Startup script for mongos

# chkconfig: 35 85 15
# description: Mongo Router Process for sharding
# processname: mongos
# config: /etc/mongo/mongos.conf
# pidfile: /var/run/mongo/mongos.pid

. /etc/rc.d/init.d/functions

# mongos will read mongos.conf for configuration settings

# Add variable to support multiple instances of mongos
# The instance name is by default the name of this init script
# In this way another instance can be created by just copying this init script
# and creating a config file with the same name and a .conf extension
# For Example:
# /etc/init.d/mongos2
# /etc/mongos2.conf
# Optionally also create a sysconfig file to override env variables below
# /etc/sysconfig/mongos2
INSTANCE=`basename $0`

# By default OPTIONS just points to the /etc/mongod.conf config file
# This can be overriden in /etc/sysconfig/mongod
OPTIONS=" -f /etc/mongo/${INSTANCE}.conf"

PID_PATH=/var/run/mongo
PID_FILE=${PID_PATH}/${INSTANCE}.pid
MONGO_BIN=/usr/bin/mongos
MONGO_USER=mongod
MONGO_GROUP=mongod
MONGO_ULIMIT=12000
MONGO_LOCK_FILE=/var/lock/subsys/${INSTANCE}

# Source sysconfig options so that above values can be overriden
SYSCONFIG="/etc/sysconfig/${INSTANCE}"
if [ -f "$SYSCONFIG" ]; then
  . "$SYSCONFIG" || true
fi

# Create mongo pids path if it does not exist
if [ ! -d "${PID_PATH}" ]; then
  mkdir -p "${PID_PATH}"
  chown "${MONGO_USER}:${MONGO_GROUP}" "${PID_PATH}"
fi

start()
{
  echo -n $"Starting ${INSTANCE}: "
  daemon --user "$MONGO_USER" --pidfile $PID_FILE $MONGO_BIN $OPTIONS --pidfilepath=$PID_FILE
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && touch $MONGO_LOCK_FILE
  return $RETVAL
}

stop()
{
  echo -n $"Stopping ${INSTANCE}: "
  killproc -p $PID_FILE -t30 -TERM $MONGO_BIN
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && rm -f $MONGO_LOCK_FILE
  [ $RETVAL -eq 0 ] && rm -f $PID_FILE
  return $RETVAL
}

restart () {
stop
start
}

ulimit -n $MONGO_ULIMIT
RETVAL=0

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  restart|reload|force-reload)
    restart
    ;;
  condrestart)
    [ -f $MONGO_LOCK_FILE ] && restart || :
    ;;
  status)
    status -p $PID_FILE $MONGO_BIN
    RETVAL=$?
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart}"
    RETVAL=1
esac

exit $RETVAL