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Try using tr -d '[blank]' instead.

The history command in 'ksh' is actually an alias to hist -l.

Use the syntax as such:
hist -l 1 999Where [1] is the first line of your history, and [999] is the last line of history you are...

EDIT: aster007 explains it better!

Does it work ??

From what I know [very little], it shouldn't.

The parenthetical ${text} is a character interpretation, and
The parenthetical $(num) is a...

However the 'mv' command will rename/delete the original *.doc file.

You might be better off, logically, copying the original *.doc files to another separate directory, and then perform a 'mv...

You've got a LONG way to go my friend!

The variable '$#' returns how many positional parameters the function has (a numerical value).

You-re setting the variable 'files' to the output of ls -a...

Why don't you just paste the text into: Word Frequency Counter (http://www.writewords.org.uk/word_count.asp)
Anyway, here is the results:

If the file data was changed, the file was modified (-mtime).
If the directory entry is changed, say from permissions then the file is changed (-ctime).