String search in NAWK

Posted on 2004-10-09
Medium Priority
Last Modified: 2006-11-17

I'm trying to have user type in a name to search for, then have it read the variable.  I need it to match exactly, thus cant use grep as they would get results by typing in 'smit' when 'smith' exists in database. Below is my nawk command. Any ideas where I'm going wrong?


# Search by Name
sleep 2
cat flight.data | tr [a-z] [A-Z] > flight.data #Change data file to UPPERCASE

echo "What Last Name do you want to search for: \n"
read lname


#nawk -F"," -v NAME=`cat lnametr` '$ 1== NAME { print }'  flight.data >
found=nawk -F"," -v '$ 1 == LNAME { print }'  flight.data >

#found=`grep -i "^$lname" flight.data`
if [ "$found" != "" ]


echo "\n\nName Found \n\n"


echo "\n\nThe Last Name" $lname "was not found \n\n
         Returning you to Last Name search  \n" ; ./name.ksh


echo "$lname" | tr [a-z] [A-Z] > lnametr

NAME=`cat lnametr`
nawk -F"," -v NAME=`cat lnametr` '$ 1== NAME { print }'  flight.data > newflight.data

echo "\n\nWhat field would you like to sort your results by: \n\n
      1) Last Name \n
      2) First Name \n
      3) Departure City \n
      4) Arrival City \n
      5) Flight Number \n
      6) Departure Date \n"

read srtfld


case "$srtfld" in

      1)sort +0 -t, newflight.data > lstname.rpt ; ./lstname.report
      2)sort +1 -t, newflight.data > lstname.rpt ; ./lstname.report
      3)sort +2 -t, newflight.data > lstname.rpt ; ./lstname.report
      4)sort +3 -t, newflight.data > lstname.rpt ; ./lstname.report
      5)sort +4 -t, newflight.data > lstname.rpt ; ./lstname.report
      6)sort +6 -t, newflight.data > lstname.rpt ; ./lstname.report
      *) echo "\007\007\007 Invalid Option.  Sorting by default 'Last Name' \n"
             sort +0 -t, newflight.data > lstname.rpt ; ./lstname.report

echo "\n\nWould you like to do another search by Last Name: \n"
read ansnamesrch
case "$ansnamesrch" in
      y*|Y*)  ./name.ksh
      echo "Retuning to Main Menu: \n"
      sleep 2 ; clear ; ./menu.ksh
Question by:elwayisgod
  • 2
LVL 21

Accepted Solution

tfewster earned 500 total points
ID: 12268575
Enclose the command in backticks + assign the passed pariable on the awk command line:
found=`nawk -F"," -v LNAME=$lname '$1 == LNAME { print }'  flight.data`

Incidentally, it would help if you said what the problem or error was and just post the code snippet that is giving you trouble ;-)

BTW, I suspect you might run into problems with
cat flight.data | tr [a-z] [A-Z] > flight.data
- if flight.data is a large file, there's a risk the output will overwrite the file before it's been fully read
Safer to do
cat flight.data | tr [a-z] [A-Z] > flight.data.new && mv flight.data.new flight.data


Author Comment

ID: 12269136
Cant get it to assign found correctly. It just hangs on the last cat statement.  I'm stuck. All help is appreciated.  What I'm trying to do put in a variable in any case and if it matches exactly to the first field in the depart_flight.data file, then print those lines to a new file called flight.data, then I do a report etc....


# Search by Departure city
cat flight.data | tr [a-z] [A-Z] > flight.data #Change data file to UPPERCASE

echo "Enter the 3 character Departure City airport code to search for: \n"
read depcty
sleep 2

nawk -F"," '{ print $3","$1","$2","$4","$5","$6","$ }' flight.data > flight.data
#cat depart_flight.data
#found=`grep -iw "depcty$" depart_flight.data`

echo "$depcty" | tr [a-z] [A-Z] > depctytr
found=`nawk -F"," -v DEPCITY=depctytr '$1 == DEPCITY { print }'  flight.data`
cat $found

LVL 21

Expert Comment

ID: 12269164
echo "$depcty" | tr [a-z] [A-Z] > depctytr              # Creates a _file_ called "depctytr" containing the output of the echo command.
I suspect you want
depctytr=`echo "$depcty" | tr [a-z] [A-Z]`

found=`nawk -F"," -v DEPCITY=depctytr.........       # passes the _string_ "depctytr" to awk; You want $depctytr, i.e. the contents of the _variable_ depctytr.  As it is, $found will be the empty string as the string "depctytr" is NOT in flight.data

cat $found                  # cat the _file_  whose name matches the contents of $found, e.g. LAX;  Is this what you wanted?  However, due to the errors above, $found="" so `cat` waits for input

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