If statement - How to write a null statement - Shell Programming and Scripting

april · #1 (**permalink**) 04-16-2008

In my ksh script, if the conditions of a if statement are true, then do nothing; otherwise, execute some commands.

How do I write the "do nothing" statement in the following example?

Example:

if (( "$x"="1" && "$y"="a" && "$z"="happy" ))
then
do nothing
else
command
command
fi

Thanks.

aigles · #2 (**permalink**) 04-16-2008

Code:

if (( "$x"="1" && "$y"="a" && "$z"="happy" ))
then
   :
else
   command
   command
fi

Another way, invert your test :

Code:

if (( "$x"!="1" || "$y"!="a" || "$z"!="happy" ))
then
   command
   command
fi

Jean-Pierre.

vgersh99 · #3 (**permalink**) 04-16-2008

Code:

if (( "$x"="1" && "$y"="a" && "$z"="happy" )); then
     :
else
   command
   command
fi

april · #4 (**permalink**) 04-16-2008

Thanks. That works.

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