Solaris

Thank you Scott...it is only available in solaris 10 not below version..is it correct?

That seems to be the case, yes.

Several points.
one -

Code:

which fgrep

is a must to figure out which fgrep you are running.
The options are different for /usr/bin/fgrep and /usr/xpg4/bin/fgrep.

two -
/usr/xpg4/bin/grep (NOT fgrep) will do exactly what you want.

Code:

/usr/xpg4/bin/grep -F -i -w

-F means run exactly like fgrep.
It is a capital letter F.

three -
fgrep is no longer supported by POSIX. It was supposed to go away in 1997. It is there so old code will not break. All new code should consider a modern grep -F (in this case /usr/xpg4/bin/grep -F).

fgrep

four -
It is important to set your PATH to select modern commands on Solaris, by having /usr/bin/xpg4 before /usr/bin in the PATH variable. Unless you are running ancient code. Or need BSD support. You should always use nawk, not awk if you want modern behavior in awk.

Why? - any example code on the internet - especially on unix.com - will show you conforming behavior for code. When you run the old grep, fgrep, or awk then the examples will not work.

Solaris 10 only. Solaris 11 has it /usr/gnu/grep. Previous releases might have it installed in /usr/local/bin/grep but there is no guarantee. There are also Solaris 10 installations when /usr/sfw/bin/ggrep is not installed but this is uncommon.
Use

Code:

man -M /usr/sfw/share/man ggrep

or add /usr/sfw/share/man to your MANPATH.

---------- Post updated at 13:07 ---------- Previous update was at 13:02 ----------

I'm afraid it won't. As far as I known, /usr/xpg4/bin/grep doesn't support the -w option when combined with -F given the fact it is not specified by POSIX (and that makes sense, searching a word is expected to be implemented by regular expressions while -F precisely disable regular expressions).

Generally the -w option is available for grep but not egrep|fgrep.