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Alternative to && operator

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# 1  
Old 07-05-2010
Alternative to && operator
"Both cases have to be true for the expression to evaluate "true". is that not so.
the following code does a read from a txt file, an then suppose to do the deletion ,but although the condition exists, its not performing the deletion
Code:
[ -z "${prt}" ] &&
   echo "\n\t Deleting printer ${prt} !!!"
   if ! $BIN/lpadmin -x ${prt} 2> /dev/null
   then
       echo " Failed to delete printer !!"
       continue
   fi
   echo "Printer ${prt} DELETED!"

Any insight to the above problem will be highly appreciated
# 2  
Old 07-05-2010
Code:
[ -z "${prt}" ] || {
   echo "\n\t Deleting printer ${prt} !!!"
   if ! $BIN/lpadmin -x ${prt} 2> /dev/null
   then
       echo " Failed to delete printer !!"
       continue
   fi
   echo "Printer ${prt} DELETED!"
}

# 3  
Old 07-06-2010
OK and if the condition does not exists, but i would like to still recreate it !
would it change the create statement?????
here is both the delete and create statements
Code:
#Delete or Create Printer
   [ -z "${prt}" ] || {
      echo "\n\t Deleting printer ${prt} !!!"
      if ! $BIN/lpadmin -x ${prt} 2> /dev/null
      then
          echo " Failed to delete printer !!"
          continue
      fi
      echo "Printer ${prt} DELETED!"
   }
      echo "Adding Printer $prt !!!!"
   if ! $BIN/lpadmin -p ${prt} -E -v ${drv}://${IP}:${port}
   then
       echo "Failed to add printers !!!"
       continue
   fi
   echo "\n\t Printer $prt:$drv://$IP:$port created"
done < diffs.txt

# 4  
Old 07-06-2010
Not tested but the following should work for you
Code:
    if [[ -z "${prt}" ]]; then
      echo "\n\t Deleting printer ${prt} !!!"
      if ! $BIN/lpadmin -x ${prt} 2> /dev/null
      then
          echo " Failed to delete printer !!"
          continue
      fi
      echo "Printer ${prt} DELETED!"
   else
      echo "Adding Printer $prt !!!!"
      if ! $BIN/lpadmin -p ${prt} -E -v ${drv}://${IP}:${port}
      then
          echo "Failed to add printers !!!"
          continue
      fi
      echo "\n\t Printer $prt:$drv://$IP:$port created"
    fi

# 5  
Old 07-07-2010
YES, YES....Smilie
Its now re-creating the printer because it does not exists.
Will it delete the printer if its exists and re-create it again??????
# 6  
Old 07-08-2010
I did the following!
  • Created a printer on my remote server.I ran the script on the local server and was happy that it created the printer on the local server just as, it was created on the remote server. IP's,name etc
  • I created another printer on my local server.I ran the script and expected the printer to be deleted.Instead it just recreated the printer which might not be required on the local sever.
  • Would the script require an adjustment or not?????Smilie
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