Using job history
Get-BEJobHistory -FromLastJobRun | Get-BEJobLog -OutputStyle [text or html]
Using file
Get-BEJobLog -Path [path to job log xml] -OutputStyle [text or html] > [output path plus filename]
These commads output to the console. To save the output to a file pipe it in to out-file
Get-BEJobHistory -FromLastJobRun | Get-BEJobLog -OutputStyle [text or html] | Out-FIle -filepath [file path]
For more help
Get-Help Get-BEJobLog