Make batch omit lines from a file-CodePudding

I'm creating a batch fingerprinter, and I'm using a mix of SystemInfo and IpConfig to get a unique sha256 hash for a computer, the problem is i the systeminfo output there are things like boot time and others that change every time, and i need a way of omitting them before i generate the hash. my current whole code is:

@echo off
systeminfo >>fingerprint.txt
echo - - - - - - - - - - - - >> fingerprint.txt
ipconfig >>fingerprint.txt
:: Here i want to have the omitter
powershell Get-FileHash fingerprint.txt -Algorithm SHA256 > comphash.txt
pause

CodePudding user response：

Found an answer thanks to Squashman, final code in case someone wants to use it is:

@echo off
color 33
systeminfo | find "Domain:" /v | find "System" /v | find "Virtual" /v | find "Available" /v >> fingerprint.txt
echo Your computers unique fingerprint: >> finalhash.txt
powershell Get-FileHash fingerprint.txt -Algorithm SHA256 >> finalhash.txt
del fingerprint.txt
start finalhash.txt
pause

CodePudding user response：

Like pretty much all information about your computer, the computer's unique identifier can be found in wmic. In this case, it's the UUID property of the csproduct class, which handles computer system product information from SMBIOS.

wmic has some extra carriage returns at the end of the data so there's a bit of tweaking that needs to be done before you can just run it through a for /f loop like a normal command, but it will look like this:

for /f "delims=" %%A in ('wmic csproduct get UUID /value ^| find "="') do set %%A

This will have the wmic command output its data in the format UUID=00000000-0000-0000-0000-000000000000 and then set the UUID to a variable called %UUID%, using find to look for the = and removing the excess carriage returns.