You just do a

#du -sk directory-name
to find out how big is a directory

&

#df
to check your mounted partitions.....

Linux requires alot's of reading too !!

Vaios

Is there a utility, like chkdsk in DOS, that would do the same in
Linux?

Please sent me mail if you can help me.

Thank you

Vasilios Milonas

df

Alex Lam

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Try  

df

Read the df man page.  You might want to also read the fsck man page
(and all related man pages depending on what file system you are
using).

man df