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:D

You could also use grep if your grep version supports the -f option:
grep -v -f fileA fileB

echo $(expr length $word)
or with ksh/bash:
echo ${#word}

gives the length of the variable.

This is working as expected for me:
$ echo $KSH_VERSION
Version JM 93t+ 2010-03-05
$ ./little_program
known
known
known


Also works OK with

ksh version M-11/16/88,
pdksh version...