Question

我编写了这个脚本，用于检查某个文件是否已被更改：

#!/bin/bash
path=$1
if [ -z "$path" ]; then
    echo "usage: $0 [path (required)]" 1>&2
    exit 4
fi

lastmodsecs=`stat --format='%Y' $path`
lastmodsecshum=`date -d @$lastmodsecs`
basedate=$newdate
if [ $lastmodsecs != $basedate ]; then
        echo "CRITICAL: $path was last modified on $lastmodsecshum !"
        newdate=`stat --format='%Y' $path`
        exit 1
else
    echo "OK: $path hasn't been modified since $lastmodsecshum \(last supervized change\)"
    exit 0
fi

如果IF语句为真，我想用最后一次更改的unix时间设置$ newdate变量，然后将其投影到位于IF之上的$ basedate变量，那可能吗？

塞尔：该脚本现在看起来像这样，结果是如果文件已被更改，则检查的状态保持在CRITICAL：/ etc / passwd上次修改date并且由于某种原因$ persist文件不是正确更新：

#!/bin/bash
path=$1
if [ -z "$path" ]; then
    echo "usage: $0 [path (required)]" 1>&2
    exit 4
fi
lastmodsecs=`stat --format='%Y' $path`
lastmodsecshum=`date -d @$lastmodsecs`
persist="/usr/local/share/applications/file"
if [ -z $persist ]
        then newdate=`stat --format='%Y' $path`
else read newdate < $persist
fi
basedate=$newdate
if [ $lastmodsecs != $basedate ]; then
        echo "CRITICAL: $path was last modified on $lastmodsecshum !"
        echo $lastmodsecs > $persist
        exit 1
else
    echo "OK: $path hasn't been modified since $lastmodsecshum \(supervized change\)"
    exit 0
fi

Answer 1

看起来你的代码应该在一个循环中运行，newdate最初是上次运行的值。通常，如果循环在脚本中，这可以正常工作：

...
# newdate first initialisation
newdate=`stat --format='%Y' $path`
while true
    do lastmodsecs=`stat --format='%Y' $path`
    lastmodsecshum=`date -d @$lastmodsecs`
    basedate=$newdate
    if [ $lastmodsecs != $basedate ]; then
            echo "CRITICAL: $path was last modified on $lastmodsecshum !"
            newdate=$lastmodsecs
            exit 1
    else
        echo "OK: $path hasn't been modified since $lastmodsecshum \(last supervized change\)"
    fi
done

但是当我看到你的exit 0和exit 1时，这个脚本也打算将状态返回给调用者。您无法使用环境，因为不允许程序修改其父环境。所以唯一的可能性是让调用者管理newdate，或者持久保存到文件中。这最后很简单，无需在调用者中进行修改：

...
persist=/path/to/private/persist/file
# eventual first time initialization or get newdat from $persist
if [ -z $persist ]
then newdate=`stat --format='%Y' $path`
else read newdate < $persist
fi
...
basedate=$newdate
if [ $lastmodsecs != $basedate ]; then
        echo "CRITICAL: $path was last modified on $lastmodsecshum !"
        echo $lastmodsecs > $persist
        exit 1
else
    echo "OK: $path hasn't been modified since $lastmodsecshum \(last supervized change\)"
    exit 0
fi

当然，当你谈到Nagios时，测试就属于你了......

Answer 2

要检查文件日期是否比上次检查的时间更新，请尝试：

#!/bin/bash
lastchecked="/tmp/lastchecked.state"       
file="/my/file"

# compare file date against date of last check 
[[ "$file" -nt "$lastchecked" ]] && echo "$file has been modified since last check"

# remember time when this check was done
touch "$lastchecked"

IF中的变量是否可以投影到IF之外的变量？

2 个答案: