Необходимо прочитать содержимое от конца файла до указанной строки в файле без использования функции tail - PullRequest
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Необходимо прочитать содержимое от конца файла до указанной строки в файле без использования функции tail

0 голосов
/ 20 мая 2019

Файл abc.txt должен быть прочитан от конца файла до определенной строки с именем "Install location: "C:\Users\desktop\1234_5467.dat".
Проблема здесь в том, что у нас есть повторяющиеся вхождения строки, такие как "1234_5467.dat", и я хочу содержимоебыть прочитанным с конца до "Место установки:" C: \ Users \ desktop \ 1234_5467.dat "" без использования tail, поскольку у нас нет четкого номера строки указанной строки в файле.Я использую чтение из конца файла, так как содержимое в файле добавляется каждый раз, так что лучше переходить от конца файла.

Я пробовал использовать Tail, хотя это работает, мы не можем продолжить работу, как в строкечисло непредсказуемо 

05/28/2019 18:25:08 - Successfully deleted HKEY_LOCAL_MACHINE\SOFTWARE\EMC\Symmwin\SystemInstallState Registry Key

05/28/2019 18:35:43 - =========================================================================

05/28/2019 18:35:43 - Installation Started

05/28/2019 18:35:43 - Installation Location: c:\Temp\456.exe

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:20 - SnippT completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:37:43 - --------------------------------------------------

05/28/2019 18:37:43 - This is the point of no return!

05/28/2019 18:37:43 - --------------------------------------------------

05/28/2019 18:37:44 - Installing Windows Features

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:48:21 - --------------------------------------------------

05/28/2019 18:48:21 - Install Complete.

05/28/2019 18:48:21 - --------------------------------------------------

05/28/2019 18:35:43 - =========================================================================

5/28/2019 18:35:43 - Installation Started

05/28/2019 18:35:43 - Installation Location: c:\Temp\3456.exe

05/28/2019 18:35:43 - Installation Started

05/28/2019 18:35:43 - Installation Location: c:\Temp\456.exe

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:20 - SnippT completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:25:03 - Aborting the installation.

Aborting the installation!.

C:\ drive does not have enough space to install the application.

The minimum space required to install Enginuity installer in C:\ Drive is 2 GB.

05/28/2019 18:35:43 - =========================================================================

05/28/2019 18:35:43 - Installation Started

05/28/2019 18:35:43 - Installation Location: c:\Temp\3456.exe

05/28/2019 18:37:44 - Installing Windows Features

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:37:43 - This is the point of no return!

05/28/2019 18:37:43 - --------------------------------------------------

05/28/2019 18:37:44 - Installing Windows Features

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:48:21 - --------------------------------------------------

05/28/2019 18:48:21 - Install Complete.

05/28/2019 18:48:21 - --------------------------------------------------

Мне нужно содержимое файла с момента последнего появления c: \ Temp \ 3456.exe до конца 

05/28/2019 18:35:43 - Installation Location: c:\Temp\3456.exe

05/28/2019 18:37:44 - Installing Windows Features

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:37:43 - This is the point of no return!

05/28/2019 18:37:43 - --------------------------------------------------

05/28/2019 18:37:44 - Installing Windows Features

05/28/2019 18:42:20 - Tools Installation Completed

05/28/2019 18:42:31 - Adobe Installation Completed.

05/28/2019 18:42:31 - Installing Paint

05/28/2019 18:48:00 - MS OFFICE Completed

05/28/2019 18:48:06 - Font Completed

05/28/2019 18:48:06 - Installing Windows Master File

05/28/2019 18:48:06 - Notepad++ Completed

05/28/2019 18:48:06 - Notepad Settings

05/28/2019 18:48:15 - ABC Installation Completed

05/28/2019 18:48:21 - --------------------------------------------------

05/28/2019 18:48:21 - Install Complete.

05/28/2019 18:48:21 - --------------------------------------------------

1 Ответ

0 голосов
/ 21 мая 2019

Этот новый текстовый пример отличает вещи от того, что вы опубликовали ранее. Используя этот новый пример, должно работать следующее: 

$file   = 'D:\blah.txt'
$search = '*Installation Location: C:\Temp\*.exe*'

# get the data as string array, remove empty or whitespace only elements
$data = Get-Content -Path $file | Where-Object { ![string]::IsNullOrWhiteSpace($_) }

if (($data -like $search).Count -eq 0) {
    Write-Warning "Search string '$search' not found in file '$file'"
}
else {
    # read the array from last to first line and collect the lines in $result
    $result = @()
    for ($i = ($data.Count -1); $i -ge 0; $i--) {
        $result += $data[$i]
        if ($data[$i] -like $search) { 
            # keep adding lines to the result until the divider string 
            # '=============================================' is found
            while (--$i -ge 0 -and $data[$i] -notmatch '.*=+') {
                $result += $data[$i]
            }
            # also add the '=============================================' ?
            # $result += $data[$i]
            # exit the for loop because we're done
            break
        }
    }

    # reverse the collected lines
    [array]::Reverse($result)
    $result
}

Результат: 

05/28/2019 18:35:43 - Installation Started
05/28/2019 18:35:43 - Installation Location: c:\Temp\3456.exe
05/28/2019 18:37:44 - Installing Windows Features
05/28/2019 18:42:20 - Tools Installation Completed
05/28/2019 18:42:31 - Adobe Installation Completed.
05/28/2019 18:42:31 - Installing Paint
05/28/2019 18:48:00 - MS OFFICE Completed
05/28/2019 18:48:06 - Font Completed
05/28/2019 18:48:06 - Installing Windows Master File
05/28/2019 18:48:06 - Notepad++ Completed
05/28/2019 18:48:06 - Notepad Settings
05/28/2019 18:48:15 - ABC Installation Completed
05/28/2019 18:37:43 - This is the point of no return!
05/28/2019 18:37:43 - --------------------------------------------------
05/28/2019 18:37:44 - Installing Windows Features
05/28/2019 18:42:20 - Tools Installation Completed
05/28/2019 18:42:31 - Adobe Installation Completed.
05/28/2019 18:42:31 - Installing Paint
05/28/2019 18:48:00 - MS OFFICE Completed
05/28/2019 18:48:06 - Font Completed
05/28/2019 18:48:06 - Installing Windows Master File
05/28/2019 18:48:06 - Notepad++ Completed
05/28/2019 18:48:06 - Notepad Settings
05/28/2019 18:48:15 - ABC Installation Completed
05/28/2019 18:48:21 - --------------------------------------------------
05/28/2019 18:48:21 - Install Complete.
05/28/2019 18:48:21 - --------------------------------------------------

Как видите, я добавил тест сейчас, чтобы проверить, находится ли используемая вами строка поиска в файле или нет. Если в файле его нигде нет, вы увидите предупреждение: 

WARNING: Search string '*Installation Location: C:\Temp\z*.exe*' not found in file 'D:\blah.txt'

и сценарий просто завершается после этого. Таким образом, вы можете больше экспериментировать с созданием строки поиска, которая работает для вас, учитывая фактический файл.

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