Awk program

BEGIN          {<initializations>} 
   <pattern 1> {<program actions>} 
   <pattern 2> {<program actions>} 
   ...
END            {< final actions >}

#Example

awk '
    BEGIN { print "\n>>>Start" }
    !/(login|shutdown)/ { print NR, $0 }
    END { print "<<<END\n" }
' /etc/passwd