#!/bin/bash
set -eu

function usage()
{
cat <<EOF
  Description:
    $(basename ${0}) is a watch commond stream log to file
  Usage:
    $(basename ${0}) [command] [logfile path] [interval](s)
  Example:
    $(basename ${0}) "echo test" /tmp/log 1
EOF
}
if [ $# -eq 0 ]
then
  usage
  exit 1
fi

COMMAND=$1
LOG_FILE_PATH=$2
CALL_INTERVAL=$3

while true
do
  ${COMMAND} 2>&1 | tee -a ${LOG_FILE_PATH}
  sleep ${CALL_INTERVAL}
done