Awk

Shell Programming and Scripting
1

I have seen a isql result set of a query in the file(Result.txt)

can anyone help me understand what the following command does..??

cat Result.txt |awk 'NR >3' |grep -v - | grep -v return

Thanx a bunch

2 
cat Result.txt     # Cat the file (not needed - useless use of cat award)

|awk 'NR >3'     # Print everything after record (i.e. line) 3

|grep -v -      # get rid od libes with  "-" in them

| grep -v return     # get rid of libes with "return" in them

HTH