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Bash 中 case 语句中的条件和范围

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Bash 中 case 语句中的条件和范围

我正在为 Nagios 编写一个插件来检查安全包的数量，并做一个案例陈述这里。

但整个事情最终变成了一场怪异的秀。我基本上想做的就是说，如果有 1-20 个包会显示此警告，如果有 21 个到无穷个包会显示严重警告等等，但我无法做到，[ -gt 1 ]甚至无法做到[20-10000]

当应用这些范围时，脚本会以某种不规则的方式运行，并在需要时发出警告，等等。我认为我明白范围在这里实际上是不可能的，我只是想知道为什么它对上面给出的示例有效，但对我却无效。此外，是否有可能以任何方式在案例中包含条件？

最后我终于写出了一个可以完全运行的脚本，但我必须创建 if 条件并将其传递给 case。我只是想知道是否有更简单的方法可以做到这一点而不必这样做。

下面大致就是我尝试做的。最后一部分是我绝望地尝试了大量不同的范围，看看是否有效。

case $SECURITY_PACKAGES in

   0)

   echo "OK - not bad: There are a total of $TOTAL_PACKAGES packages to upgrade in this server, but none of them are security updates!"

   exit 0

   ;;

   [1-20]*)

  echo "WARNING - $TOTAL_PACKAGES packages required to upgrade in this server, of which $SECURITY_PACKAGES are security updates"

 exit 1
  ;;

   [21-99]|[100-999]|[1000-9999]*)

   echo "CRITICAL -  $SECURITY_PACKAGES out of $TOTAL_PACKAGES are security     updates! Consider upgrading soon!"

 exit 2
;;

*) echo "UNKNOWN - I am not sure what's happening now, check later or check server: $TOTAL_PACKAGES to upgrade, $SECURITY_PACKAGES are security updates"

exit 3
;;

esac

答案1

您无法在表达式中轻松表达数字范围-例如，case模式[1000-9999]并不意味着1000到 的数字9999，但字符1、0、0、范围0-9、字符9、9、9- 基本上是所有数字。[1-85]并不意味着1到 的数字，而是从到 的85数字，和、 ... 只是从到 的数字。 因此意味着以、、 或-开头的任何内容都会匹配。 改用/ / / / ：18518[1-20]*12020000000ifthenelifelsefi

if (( $SECURITY_PACKAGES == 0 ))
then
    echo "OK - not bad: There are a total of $TOTAL_PACKAGES packages to upgrade in this server, but none of them are security updates!"
    exit 0
elif (( $SECURITY_PACKAGES <= 20 ))
then
    echo "WARNING - $TOTAL_PACKAGES packages required to upgrade in this server, of which $SECURITY_PACKAGES are security updates"
    exit 1
elif (( $SECURITY_PACKAGES <= 9999 ))
then
    echo "CRITICAL -  $SECURITY_PACKAGES out of $TOTAL_PACKAGES are security     updates! Consider upgrading soon!"
    exit 2
else
    echo "UNKNOWN - I am not sure what's happening now, check later or check server: $TOTAL_PACKAGES to upgrade, $SECURITY_PACKAGES are security updates"
    exit 3
fi

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