Win10 - 如何从一个命令中将 pipe output 作为另一个命令的参数来检查文件 hash？

Question

Lets say that I need to verify the md5 hash of a file against the hash provided by the website.

I use certutil -hashfile.\amazon-corretto-11.0.10.9.1-windows-x64.msi md5 or Get-FileHash -Path.\amazon-corretto-11.0.10.9.1-windows-x64.msi -Algorithm md5 in powershell to get the hash, then I look at the hash from the download website, and compare them letter by letter. Is there a way to let the command line do the comparison?

I tried certutil -hashfile.\amazon-corretto-11.0.10.9.1-windows-x64.msi md5 | echo == "website_hash" certutil -hashfile.\amazon-corretto-11.0.10.9.1-windows-x64.msi md5 | echo == "website_hash" , but it didn't work.

Solutions in command line and powershell are both welcomed.

Answer 1

You can simply enclose a command in (...) , the grouping operator , if you want its output to act as an operand to an operator, such as -eq , the equality operator :

(certutil -hashfile .\amazon-corretto-11.0.10.9.1-windows-x64.msi md5)[1] -eq "website_hash"

Note: postanote points out that certutil outputs mutiple lines, with the hash of interest being on the second line, which the [1] index access returns, based on PowerShell returning the output lines from external programs as an array of strings .

Answer 2

Continuing from my comment . Try this:

Get-FileHash -Path 'D:\temp\book1.txt' -Algorithm MD5 | 
Format-Table -AutoSize
# Results
<#
Algorithm Hash                             Path             
--------- ----                             ----             
MD5       D572724F26BD600773F708AB264BE45B D:\temp\book1.txt
#>


$CompareObjectSplat = @{
    DifferenceObject = (Get-FileHash -Path 'D:\temp\book1.txt' -Algorithm MD5).Hash
    ReferenceObject  = (Get-FileHash -Path 'D:\temp\book1.txt' -Algorithm MD5).Hash
}
Compare-Object @compareObjectSplat -IncludeEqual

# Results
<#
InputObject                      SideIndicator
-----------                      -------------
D572724F26BD600773F708AB264BE45B == 
#>

# Get specifics for a module, cmdlet, or function
(Get-Command -Name Get-FileHash).Parameters
(Get-Command -Name Get-FileHash).Parameters.Keys
Get-help -Name Get-FileHash -Examples
Get-help -Name Get-FileHash -Full
Get-help -Name Get-FileHash -Online


(Get-Command -Name Compare-Object).Parameters
(Get-Command -Name Compare-Object).Parameters.Keys
Get-help -Name Compare-Object -Examples
Get-help -Name Compare-Object -Full
Get-help -Name Compare-Object -Online

Tagging on to this as per mklement0's helpful response to you and your follow-up query.

# Command line - executable
(certutil -hashfile 'D:\temp\book1.txt' md5)
# Results
<#
MD5 hash of D:\temp\book1.txt:
d572724f26bd600773f708ab264be45b
CertUtil: -hashfile command completed successfully.
#>

(certutil -hashfile 'D:\temp\book1.txt' md5)[1] -eq (certutil -hashfile 'D:\temp\book1.txt' md5)[1]
# Results
<#
True
#>

Answer 3

Based on @postanote and @mklement0's answers, here are 2 powpershell one-liners to very file hash, both ignores cases.

certutil:

(certutil -hashfile ./amazon-corretto-11.0.10.9.1-windows-x64.msi MD5)[1] -eq ("EE569A19016F233B2050CC11219EBBFD")

Get-FileHash:

Compare-Object -ReferenceObject (Get-FileHash -Path '.\amazon-corretto-11.0.10.9.1-windows-x64.msi' -Algorithm MD5).Hash -DifferenceObject ("EE569A19016F233B2050CC11219EBBFD") -IncludeEqual