Powershell command to delete all the lines matching a word from a file.

powershell_delete_line

# PowerShell
Get-Content <sometext_or_log_file> | Where-Object {$_ -notmatch "<exact string>"} | Set-Content <outputfile>

# Example

Get-Content W3000454.log | Where-Object {$_ -notmatch "ping"} | Set-Content c:\log\W3000454_no_ping.log
# The above command will strip all the lines matching the word "ping" and writes to W3000454_no_ping.log

thanks dude