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I used this one for KSH scripting:
http://www.bolthole.com/solaris/ksh.html

for sed:
http://www.pegasus.rutgers.edu/~elflord/unix/sed.html

for awk:
http://www.vectorsite.net/tsawk1.html
...

I would use until

#!/bin/ksh
numOfAcct=4
ncounter=1
until [[ $ncounter -gt 4 ]];do
echo $ncounter
ncounter=`calc "$ncounter + 1"`
done

Same as Perderabo's but a one liner

sed '$d' < file1 > file2 ; mv file2 file1