Shell Programming and Scripting

SSHAuthorizedKeys="authorized_keys"
SSHD_PORT=54321
ENABLE_PASSDB_AUTHENTICATION="0"
ENABLE_SSH_AUTHENTICATION="1"
ENABLE_SU_AUTHENTICATION="0"
ENABLE_USER_DB="0"
NX_LOG_LEVEL=5

#
# easy - copy config_file to tmp_file
# easy - remove header ( top 10 lines ) in tmp_file
#
read first good key value from good_config.txt
while finished = false ; do
   search if key exist in tmp_file
   if yes
      if commented out then
          uncomment it
      fi
      force current good value
   else
      add this current good value at the top of tmp_file
  fi
  read good key value from good_config.txt
  get one ?
  if not
      finished = true
  fi
done

awk '
  NR==FNR {
  good_value[$1]=$2;
  next;
}
/^ *#/ { next; }
{
  if ($1 in good_value && $2!=good_value[$1]) {print "#" $0; $2=good_value[$1]};
  print $1,$2;
}
' FS="=" good_config.txt OFS="=" config_file > tmp_file

awk     'BEGIN {FS=OFS="="}
         NR==FNR {good_value[$1] = $2
                  next
                 }
         {iscomment = gsub (/#/, "", $1)}
         {if ($1 in good_value) {$2 = good_value[$1]; iscomment=0}
          if (!iscomment) print $1,$2;
          delete good_value [$1]
         }          
         END {for (i in good_value) print i, good_value[i]}
        ' good_config.txt config_file