BASH 语法错误 - [ : missing `]'

Question

我是 Bash 编程的新手，可能真的很傻。

基本上我正在编写一段脚本，它将对我传入的 IP 地址执行 ping 操作，它将从中获取传输的数据包，并根据丢失的数据包数量返回错误或通过消息。

但是，每当我从终端运行脚本时，我都会收到消息 -

./ipGatewayCheck.sh:第 13 行:[: missing]'`

这是我的代码:

#!/bin/bash

healthy_status=0

warning_status=10

critical_status=100

for gateway in $@

do
RESULT=`ping -q -c 10 $gateway | grep 'packets transmitted' | awk '{print $6}' | tr -d "%"`
echo "$RESULT"
if [ $RESULT -eq $healthy_status ]; then
  echo "No Issue - IP Address is pinging"
elif [ $RESULT -ge $warning_status && -le $critical_status ]; then
  echo "Warning - Issue with packet loss on this IP Address"
elif [ $RESULT -eq $critical_status ]; then
  echo "Critical - 100% packet loss on this IP Address"
fi

done

如有任何帮助，我们将不胜感激。

Answer 1

您需要使用 [[ 和 ]] 才能在方括号内使用 &&:

if [[ "$RESULT" -eq "$healthy_status" ]]; then
  echo "No Issue - IP Address is pinging"
elif [[ "$RESULT" -ge "$warning_status" && "$RESULT" -le "$critical_status" ]]; then
  echo "Warning - Issue with packet loss on this IP Address"
elif [[ "$RESULT" -eq "$critical_status" ]]; then
  echo "Critical - 100% packet loss on this IP Address"
fi

或者，您也可以在 BASH 中使用 (( 和 )):

if (( RESULT == healthy_status )); then
  echo "No Issue - IP Address is pinging"
elif (( RESULT == warning_status && RESULT < critical_status )); then
  echo "Warning - Issue with packet loss on this IP Address"
elif (( RESULT == critical_status )); then
  echo "Critical - 100% packet loss on this IP Address"
fi