String comparison

46019 · #1 (**permalink**) 07-10-2009

Hi,

I have the below logic. Here 'X' is a variable having some string.

if [$X = "Today is holiday."]
then
echo "i dont need to go to ofc"
else
echo "i need to go to ofc"

Please help me to write it in unix.

Thanks.

zaxxon · #2 (**permalink**) 07-10-2009

Use CODE-tags when posting code, data or logs for better readability and in this case for keeping formatting/indention, ty.

Change the = vs == and try again. If it still does not work, try double square brackets ie. [[ ]].

More to read up here:
Tests

kshji · #3 (**permalink**) 07-10-2009

Remember, it is always commandline = argument delimeter.
test ( = [ ) is command, ... [ ] are not bracket as in some programming languages.
if need if-block end = fi.
Also use always "" with variable. Why ? If variable is empty, you get error, but if it is "$variable", it's always string with length >= 0.

Code:

if  [  "$X" = "Today is holiday."  ]
then 
   echo "i dont need to go to ofc"
else
   echo "i need to go to ofc"
fi

Double bracket is different command as single = differerent arguments and so on.

more about if, testing, ...

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