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For me - only for ! or negative condition I should have to put space after IF,"[" and "]" but for normal or posivitive condtion only one space after if working. Anyway it good practice to put space...

OMG ...It really funny now it's working just putting space after IF ... welcome to shell scripting .. :)

if [-d /var/log/messages]
then
echo "This dir not exists."
fi

Thanks much...

Yes I tried to use the space

if[[ -f /var/log/messages ]]
then
echo "This dir not exists."
fi

Error :
if[[ -f /var/log/messages ]]: not found
syntax error: `then' unexpected
...

Still it's not working after using space.
Its giving error as
if[ -f /var/log/messages ]: not found #==> I did put one space at start and end of [ ]
syntax error: `then' unexpected

#! /bin/ksh

rm -f ./xyz file --- this line is working

// Below any if stmt is not working.
if[-f /var/log/messages ]
then
echo " blah blah "
fi

or I replaced above if with
if[-d...