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unix compare two variable

 
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# 1  
Old 11-19-2009
unix compare two variable
how can i unix compare two variable??

var1 = 6499 7328 6351 7583 7573
var2 = 6499 7328 6351 7583 7573
i did:
diff $var1 $var2
and i got the output:
diff: extra operand `6351'
diff: Try `diff --help' for more information.


whats wrong??
# 2  
Old 11-19-2009
Hi.

'Diff' command is used to compare files.

To compare two variables you must use:
Code:
if [ "$var1" = "$var2" ]
.....

# 3  
Old 11-19-2009
You use test to compare variables.

Code:
if test "var1" = "$var2"; then
   ....
fi

or 

if [ "$var1" = "$var2" ]; then
  ...
fi

Code:
man test

# 4  
Old 11-19-2009
ok, but i wanna know what is the different between the 2 variable
like if:
var1 = a b c d
var2 = a b c f
so i need to know that the different is that var2 have f insted of d
or somthing like that...

??
# 5  
Old 11-19-2009
diff is a command that compares 2 files not 2 strings. You probably mean something like this.

Code:
 #!/bin/bash
  s_one='string'
   s_two='String'
  if [ $s_one=$s_two ];
   then
    echo "s_one('$s_one') is not equal to s_two('$s_two')"
   fi
    if [ $s_one=$s_one ];
    then
         echo "s_one('$s_one') is equal to s_one'$s_one')"
      fi

Hope this helps
# 6  
Old 11-19-2009
Checking to see if the variables are different, and checking if one variable contains a certain character are not the same thing.

Code:
if [ "$var1" != "$var2" ]; then
  echo var1 and var2 are different
  [ "${var2%%f*}" != "$var2" ] &&  echo var2 contains an f
fi

 
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