Re: Help required on the following...

From: Chris F.A. Johnson (c.f.a.johnson_at_rogers.com)
Date: 04/25/03 

Date: 25 Apr 2003 20:20:39 GMT

On Fri, 25 Apr 2003 at 16:20 GMT, pdqd wrote:
> Hi Friends,
> -
> Could you please guide me on the following...

    First, you should use a meaningful subject for your post,
    e.g. Shell script homework.

    Second, use the appropriate newsgroup; in this case,
    comp.unix.shell. Followup set.

> 1. How can i use find command so that it searches for only those
> directories for which the user who is running the command has
> permission?
> Also is it possible to skip searching a particular
> directory(directories)?

man find

> 2. How to search for a big chunk of text in a file?

    How big is big?
    Define "chunk".
    Does it span more than one line?
 
> 3. How to display few lines starting from nth line of a large file (vi
> fails saying memory shortage)

    Use any of the following:

man head; man tail
man awk
man sed
man $SHELL

> 4. What is the best strategy to remove an entry from the PATH variable

man cut
man $SHELL ## search for IFS

> 5. What is the best strategy to remove nth line (or range of lines)
> from a file?

    Invert the logic after you work out no. 3.

> 6. I have a file which has got very large line , how could i use the
> vi to open such a file?

    Get a new version of vi, or use a different editor.

> 7. Is it possible to yank a block of text(contiguous but can contian
> partial words, lines etc)?

man $EDITOR

> 8. Is it possible to search for a string in vi with case insensitive
> mode?

man vi

> 9. If i open many files in vi , how will switch between the windows?
> (like alt-tab feature of win )

man vi

> 10. How can I know the exact size of a directory? (du <dir-name> lists
> file by file ). also, since the output of the du is in blocks, is
> there any way i can know the size of block in that particular system?

man du

> 11. Is there anyway of recovering a deleted file?

    Restore from backup.

> 11. How can i know the size of physical memory , hardisk(total of all
> filesystems) of a system?

man -k memory
man df
man du 

-- 
    Chris F.A. Johnson                        http://cfaj.freeshell.org
    ===================================================================
    My code (if any) in this post is copyright 2003, Chris F.A. Johnson
    and may be copied under the terms of the GNU General Public License

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