reduce the or conditions

hitmansilentass · #1 (**permalink**) 05-02-2007

Hi ,

how can i reduce the or conditions:

if [[ -z $XXXX || -z $YYYYY || -z $TTTT || -z $NNNN || -z $QQQQ ]]; then

whatever

fi

jim mcnamara · #2 (**permalink**) 05-02-2007

Do you want to speed it up? Consider putting the likeliest cases on the left hand side of the if statement, if this is POSIX shell.

Otherwise, what are you trying to do?

kahuna · #3 (**permalink**) 05-02-2007

How about?

Code:

case "+$XXXX+$YYYYY+$TTTT+$NNNN+$QQQQ+" in
 *++* ) whatever;;
esac

ahmedwaseem2000 · #4 (**permalink**) 05-02-2007

Incorrect post, Moderators please delete this

hitmansilentass · #5 (**permalink**) 05-02-2007

Quote:

Originally Posted by jim mcnamara

Do you want to speed it up? Consider putting the likeliest cases on the left hand side of the if statement, if this is POSIX shell.

Otherwise, what are you trying to do?

I am trying to check if all the variables has been initialized or not. there are too many 'or' (||) conditions which i want to reduce so that it looks better

kahuna · #6 (**permalink**) 05-02-2007

Quote:

Originally Posted by hitmansilentass

there are too many 'or' (||) conditions which i want to reduce so that it looks better

It's not clear what you mean by "looks better". Exactly what would "look better" look like? Assuming your variables do not contain whitespace, another alternative without || might be

Code:

if [[ `echo $XXXX $YYYYY $TTTT $NNNN $QQQQ |wc -w` -ne 5 ]]; then
whatever
fi

cfajohnson · #7 (**permalink**) 05-02-2007

Quote:

Originally Posted by hitmansilentass

Hi ,

how can i reduce the or conditions:

if [[ -z $XXXX || -z $YYYYY || -z $TTTT || -z $NNNN || -z $QQQQ ]]; then

whatever

fi

To exit the script if any var is empty or unset:
Code:
: ${XXXX:?} ${YYYYY:?} ${TTTT:?} ${NNNN:?} ${QQQQ:?}
To execute something if any parameter is empty or unset:
Code:
var=${XXXX:+A}${YYYYY:+A}${TTTT:+A}${NNNN:+A}${QQQQ:+A}
if [ ${#var} -ne 5 ]; then

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
How to giv two conditions in IF statement..??	RRVARMA	Shell Programming and Scripting	6	04-25-2008 09:33 AM
problem with if, while, for conditions	kittusri9	Shell Programming and Scripting	3	04-24-2008 09:15 AM
multiple conditions in if/then	grandtheftander	UNIX for Dummies Questions & Answers	4	07-21-2006 01:58 PM
if statement with two conditions	cin2000	Shell Programming and Scripting	1	01-23-2006 03:21 PM
if statement with two conditions -e, &&	yongho	Shell Programming and Scripting	16	06-14-2005 04:46 PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread: