Re: COMMAND FOR CP

[Eric Blake]

> i have 4nos files which is to be copied to another name.
> i.e
> 
> file1.GNT
> file2.GNT 
> file3.GNT
> file4.GNT
> the above files to be copied at a stretch as 
> file1.gnt
> file2.gnt 
> file3.gnt
> file4.gnt
> I am using the following command
> cp *.GNT   *.gnt      whereas it is not working in LINUX

cp cannot do that.  The glob (*.GNT or *.gnt) is expanded by the
shell, not by cp, and if the glob does not succeed, the shell
passes that part unchanged.  So trying the following:

echo cp *.GNT *.gnt

would show that you are trying to execute

cp file1.GNT file2.GNT file3.GNT file4.GNT *.gnt

which doesn't make sense to cp since *.gnt does not
exist as a directory name.

However, if you are using bash or a similar shell, the
following construct would do what you desire:

for f in *.GNT; do cp "${f/.GNT}.gnt" ; done

-- 
Eric Blake