shell 脚本中定义log日志

#!/bin/bash
workspace=$(cd `dirname $0`/.; pwd)
cd $workspace

function _log_error() {
  echo -e >&2 "`date "+[%F %T %z]"`\033[31m[E]\033[0m $@"
}
function _log_info() {
  echo -e "`date "+[%F %T %z]"`\033[32m[I]\033[0m $@"
}
function _log_warn() {
  echo -e "`date "+[%F %T %z]"`\033[33m[W]\033[0m $@"
}