Question

我有一个以这样开头的bash脚本：

#!/bin/bash
systemStateGlobalSystemState=.1.3.6.1.4.1.674.10909.1.200.10.1.2
systemStateChassisStatus=.1.3.6.1.4.1.674.10909.1.200.10.1.4
systemStateVoltageStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.12
systemStateTemperatureStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.24
systemStateMemoryDeviceStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.27
         systemStateChassisIntrusionStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.30
operatingSystemMemoryStatus=.1.3.6.1.4.1.674.10909.1.400.20.1.4

RESULT=$(/usr/local/nagios/libexec/check_snmp -H $1 -o $2 -c $3)
CODE=$(echo $RESULT | awk '{print $4}')

我想要做的是，如果$ 2命令行参数的某人进入 operatingSystemMemoryStatus ，如何在脚本中为它选择预定义的值？因此，在RESULT中引用了上面的$ 2，如何使用 .1.3.6.1.4.1.674.10909.1.400.20.1.4 值获得该命令？

所以，如果我进入

check_snmp 192.168.0.1 operatingSystemMemoryStatus public script

会做：

/usr/local/nagios/libexec/check_snmp -H 192.168.0.1  -o .1.3.6.1.4.1.674.10909.1.400.20.1.4 -c public

我该如何做到这一点？

Answer 1

我认为，您希望使用这样的间接扩展：

#!/bin/bash
systemStateGlobalSystemState=.1.3.6.1.4.1.674.10909.1.200.10.1.2
systemStateChassisStatus=.1.3.6.1.4.1.674.10909.1.200.10.1.4
systemStateVoltageStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.12
systemStateTemperatureStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.24
systemStateMemoryDeviceStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.27
systemStateChassisIntrusionStatusCombined=.1.3.6.1.4.1.674.10909.1.200.10.1.30
operatingSystemMemoryStatus=.1.3.6.1.4.1.674.10909.1.400.20.1.4

echo "you are looking for ${!2} value"
RESULT=$(/usr/local/nagios/libexec/check_snmp -H $1 -o ${!2} -c $3)
CODE=$(echo $RESULT | awk '{print $4}')

并称之为

./myscript 192.168.0.1 operatingSystemMemoryStatus public script

you are looking for .1.3.6.1.4.1.674.10909.1.400.20.1.4 value
<expected result, which I cannot simulate on my box>

在man bash中，您可以阅读

   If the first character of parameter is an exclamation point (!), it introduces a level of variable indirection.  Bash uses the value of the variable  formed
   from  the  rest of parameter as the name of the variable; this variable is then expanded and that value is used in the rest of the substitution, rather than
   the value of parameter itself.  This is known as indirect expansion.

Answer 2

您可以使用关联数组来实现此目的：

declare -A lookup=(['foo']='bar' ['x']='y')
echo "${lookup[foo]}" # Prints "bar"

Answer 3

使用开关结构。我为所有选项添加了一个3个字母的替代选项：

case $2 in
   "gss"|"systemStateGlobalSystemState")
       check=".1.3.6.1.4.1.674.10909.1.200.10.1.2"
       ;;
   "scs"|"systemStateChassisStatus")
       check=".1.3.6.1.4.1.674.10909.1.200.10.1.4"
   ;;
   "vsc"|"systemStateVoltageStatusCombined")
       check=".1.3.6.1.4.1.674.10909.1.200.10.1.12"
   ;;
   "tsc"|"systemStateTemperatureStatusCombined")
       check=".1.3.6.1.4.1.674.10909.1.200.10.1.24"
   ;;
   "dsc"|"systemStateMemoryDeviceStatusCombined")
       check=".1.3.6.1.4.1.674.10909.1.200.10.1.27"
   ;;
   "isc"|"systemStateChassisIntrusionStatusCombined")
       check=".1.3.6.1.4.1.674.10909.1.200.10.1.30"
   ;;
   "sms"|"operatingSystemMemoryStatus")
       check=".1.3.6.1.4.1.674.10909.1.400.20.1.4"
   ;;
   *) echo "Invalid option $1"
   ;;
esac
echo "Use $check now"

我刚刚复制/粘贴了这些值。不是最好的方法，您可以引入变量来简化比较和更新值：

precheck=".1.3.6.1.4.1.674.10909.1"
systemcheck="200.10.1"
oscheck="400.20.1"
    case $2 in
       "gss"|"systemStateGlobalSystemState")
           check="${precheck}.${systemcheck}.2"
           ;;
       "scs"|"systemStateChassisStatus")
           check="${precheck}.${systemcheck}.4"
       ;;
       "vsc"|"systemStateVoltageStatusCombined")
           check="${precheck}.${systemcheck}.12"
       ;;
       "tsc"|"systemStateTemperatureStatusCombined")
           check="${precheck}.${systemcheck}.24"
       ;;
       "dsc"|"systemStateMemoryDeviceStatusCombined")
           check="${precheck}.${systemcheck}.27"
       ;;
       "isc"|"systemStateChassisIntrusionStatusCombined")
           check="${precheck}.${systemcheck}.30"
       ;;
       "sms"|"operatingSystemMemoryStatus")
           check="${precheck}.${oscheck}.4"
       ;;
       *) echo "Invalid option $1"
       ;;
    esac
    echo "Use $check now"

bash脚本根据命令行参数选择变量

3 个答案: