How to Compare 2 Strings ?


 
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# 1  
Old 07-27-2010
How to Compare 2 Strings ?

Hello , I want to Compare with 2 strings and get if they are True or not
please would like some help on this

Code:
#!bin/ksh
echo "Enter Name 1"
read Name1
echo "Enter Name 2"
read Name2
echo "------------------------"
echo "First Name: $Name1"
echo "Second Name: $Name2"
echo "------------------------"
if $Name1 = $Name2
then
echo "True"
else
echo "False"
fi

# 2  
Old 07-27-2010
Code:
if [[ "$Name1" = "$Name2" ]]
then
     # at this point we know they are equal
else
     # at this point we know they are not equal
fi

syntax correction....
# 3  
Old 07-27-2010
Quote:
Originally Posted by jim mcnamara
Code:
if [[ "$Name1" = "$Name2" ]]
then
     # at this point we know they are equal
else
     # at this point we know they are not equal
fi

syntax correction....
jim why is it '=' and not '=='? Doesn't the '=' assign the value of name2 to name1, whereas the '==' will compare it?
# 4  
Old 07-27-2010
i Did what "JIM" Sad and i get an output of "unknown test operator"
# 5  
Old 07-27-2010
Quote:
Originally Posted by shatztal
i Did what "JIM" Sad and i get an output of "unknown test operator"
yes thought you may, instead of the single '=', try replacing it with '=='
e.g.
Code:
if [[ "$Name1" == "$Name2" ]]
then
     # at this point we know they are equal
else
     # at this point we know they are not equal
fi

# 6  
Old 07-27-2010
i have tried this also and still this is the output
# 7  
Old 07-27-2010
Quote:
Originally Posted by linuxkid
yes thought you may, instead of the single '=', try replacing it with '=='
e.g.
Code:
if [[ "$Name1" == "$Name2" ]]
then
     # at this point we know they are equal
else
     # at this point we know they are not equal
fi

Single = is the "correct" way, although either will generally work.

If you're using sh, say, on Solaris, then I'd use
Code:
if [ "$Name1" = "$Name2" ]; then
  ...
fi

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