Glossary: Command Line for IT: Bash and PowerShell

awk

Also written: $NF, NF, $(NF-3)

A Linux tool that splits each line into fields at spaces: $1 is the first field, $NF the last, and $(NF-3) the fourth from the end, which is the address in a Failed password line. It can also filter, as in awk '$1 >= 100'.