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Comparing Strings in ksh88


 
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# 1  
Old 07-01-2013
Comparing Strings in ksh88

Hi I tried the following string comparison script in Ksh88

Code:
#!/bin/ksh
str1='aC'
str2='ABC'
if [ $str1==$str2 ]
 then
   echo "Equal"
else
   echo "Not Equal"
fi

Though str1 and str2 are not equal the script output says Equal .
Please correct me

Thanks
# 2  
Old 07-01-2013
The if statement has to be modified as below as per syntax

Code:
if [ $str1 == $str2 ]

Without the spaces, it considers the expression as a string and evaluates to true as it is non-zero.
This User Gave Thanks to krishmaths For This Post:
# 3  
Old 07-01-2013
Spaces on both side of "=" are necessary.

Code:
if [ $str1 == $str2 ]

I believe ksh88 uses single "=" syntax though not sure.

Code:
if [ $str1 = $str2 ]

Further, to avoid syntax error in case any variable is null, always quote the variables.

Code:
if [ "$str1" = "$str2" ]

Lastly, a safer way is,

Code:
if [ "x${str1}" = "x${str2}" ]

This User Gave Thanks to clx For This Post:

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