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If condition problem

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# 1  
Old 09-10-2015
If condition problem
Hi All,

I am using below if condition to check whether null is passed as a parameter to the program

Code:
  if ["$3"="null"] or ["$4"="null"];
 then
 echo "ABC">>$FILE
 else 
 echo "CDF">>$FILE
 fi

However it is saying me null=null command not found . Please help me with this
# 2  
Old 09-10-2015
Hello Hypesslearner,

Could you please try following and let me know if this helps.
Code:
if [[ "$3"="null" || "$4"="null" ]]
then
     echo "ABC" >> "$FILE"
else
     echo "CDF" >> "$FILE"
fi

Thanks,
R. Singh
Last edited by RavinderSingh13; 09-10-2015 at 09:02 AM..
This User Gave Thanks to RavinderSingh13 For This Post:
Hypesslearner
# 3  
Old 09-10-2015
Just querying:-

Are you sure you are looking for the four ASCII characters 'null' or do you really mean "" as a null.

If so this might be what you are looking for:-
Code:
if [ "$3" = "" ] || [ "$4" = "" ]

# 4  
Old 09-10-2015
I am looking for 4 ascii characters and its working now with above code . Thanks all .
# 5  
Old 09-10-2015
Have a try with:
Code:
[ -z "$3$4" ] && echo "Var 3+4 are empty"
[ 3 -eq $# ] && echo "Script has 3 args"
echo "Arg 1 has ${#1} Chars

Note that [[ condition ]] is called bashism, as it allows the 'not using' quotes, which is bad for code portability.
Instead, try to get used to [ condition ] which requires proper quoteing but beeing POSIX standard, it is much more compatible among different shells.

Hope this helps
# 6  
Old 09-14-2015
Parameter checking is not working

I am passing as below
$2=ABC and $3,$4 as empty but this is executing step1


Code:
 if [["$2"!="" && "$3"!="" && "$4"!=""]]
 then
 echo "Execute step1
 else 
   echo "Execute step2"
 fi

Last edited by rbatte1; 09-14-2015 at 01:11 PM.. Reason: Removed FONT/SIZE coding
# 7  
Old 09-14-2015
Separate all the quoted strings with spaces from their neighbourhood.
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