don't process last line

[longhair]

afternoon all,
hpux11
based on the following:

cat /files/dsdcwhd.txt | while read dcoff dctty dcmnth dcday dctime
  do
   finger -i |grep $dctty >> /files/dsdcwhd1.txt
  done

is there a graceful way to not process a line? within dsdcwhd.txt i do not want to process the last line, it does not contain an entry for dctty and therefore throws an error when passed to grep.
thanks in advance.
regards,
longhair

 

[longhair]

ok - think i have it but am a little confused...

cat /files/dsdcwhd.txt | while read dcoff dctty dcmnth dcday dctime
  do
    if
      test -n $dctty
    then
      finger -i |grep $dctty >> /files/dsdcwhd1.txt
    fi
  done

this will only process the finger line if dctty contains a value.
however when i run the script manually it returns
./dcoffend[15]: test: Specify a parameter with this command
although the output is correct an d the rest of the script process correct.
any reason?
regards,
longhair

 

[longhair]

never mind - found it..
test -n "$dctty"
regards,
longhair