Gdb and core files

Mit program lave ikke core fil når den laver et crash
og det vil jeg gerne have den til hvad skal jeg gøre?
programmet køre på linux, Shell Bash
start med
csh ./startup &


#!/bin/csh
# Set the port number.
set port = 9999
# if ( "$1" != "" ) set port="$1"

# Change to area directory.
cd ../web

# Set limits.
if ( -e shutdown.txt ) rm -f shutdown.txt

while ( 1 )
    # If you want to have logs in a different directory,
    #  change the 'set logfile' line to reflect the directory name.
    # Set the file name to m,d,y
    set index = `date '+%m-%d-%y=%H:%M:%S'`

    while ( 1 )
    set logfile = ../../../logs/$index.log
    if ( ! -e $logfile ) break
    @ index++
    end

    # Run rom.
    ../src/web $port >&! $logfile

    # ADD THIS LINE
#    echo q|gdb -c core ../src/web >&! $logfile.crash
 
    # Restart, giving old connections a chance to die.
    if ( -e shutdown.txt ) then
    rm -f shutdown.txt
    exit 0
    endif
    sleep 15
end