shell-programming HELP!!!

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March 13th, 2004, 07:56 PM

007spy

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shell-programming HELP!!!

write a shell script that will scan the files in 2 directories,finding identical files and replacing them by "hard" link to a single copy. "identical" means
same size, same content, same ownership(UID & GID) and same permission. If two same files have different timestamps, use the oldest as the original to copy and we only check the "ordinary" files in the first level of the directory. The script will take 2 command line arguments which are the names of the two directories to check.

My idea is to
using ls command to display a directory and store the contents in a file named "file1";
So do for the second directory, and name "file2";
compare "file1" and "file2" using cmp or diff command;

However how can I find all identical files from the compared result? Please help me, thanks a lot!

March 15th, 2004, 01:19 AM

eworley

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It is clear from this post, and from your post in the C/C++/C-Obj section that you are trying to get someone to write code for you. It is also clear that you are only giving us a small amount of information that is most likely straight off of a handout that you got in school.

Good luck, you will need it.

-Evan

March 15th, 2004, 07:09 AM

jlk

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Quote:

Originally Posted by eworley

<sniff sniff>.......smell that.........<sniff sniff>............it smells like........<sniff sniff>.........AH, Yes.... HOMEWORK!!!

(Not to mention his same post in the Linux forum as well.

jlk

May 4th, 2004, 01:17 AM

NPRao

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I think you can use the unix command rsync

Quote:

rsync rsync
NAME
rsync - faster, flexible replacement for rcp

SYNOPSIS
rsync [OPTION]... SRC [SRC]... [USER@]HOST

EST

rsync [OPTION]... [USER@]HOST:SRC DEST

rsync [OPTION]... SRC [SRC]... DEST

rsync [OPTION]... [USER@]HOST::SRC [DEST]

rsync [OPTION]... SRC [SRC]... [USER@]HOST:

EST

rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]

rsync [OPTION]... SRC [SRC]... rsync://[USER@]HOST[:PORT]/DEST

DESCRIPTION
rsync is a program that behaves in much the same way that rcp does,
but has many more options and uses the rsync remote-update protocol to
greatly speed up file transfers when the destination file already
exists.

The rsync remote-update protocol allows rsync to transfer just the
differences between two sets of files across the network link, using
an efficient checksum-search algorithm described in the technical
report that accompanies this package.

Some of the additional features of rsync are:

o support for copying links, devices, owners, groups and
permissions

o exclude and exclude-from options similar to GNU tar

o a CVS exclude mode for ignoring the same files that CVS would
ignore

o can use any transparent remote shell, including rsh or ssh

o does not require root privileges

o pipelining of file transfers to minimize latency costs

o support for anonymous or authenticated rsync servers (ideal for
mirroring)

GENERAL
There are eight different ways of using rsync. They are:

rsync
o for copying local files. This is invoked when neither source nor
destination path contains a : separator
o for copying from the local machine to a remote machine using a
remote shell program as the transport (such as rsh or ssh). This
is invoked when the destination path contains a single :
separator.
o for copying from a remote machine to the local machine using a
remote shell program. This is invoked when the source contains a
: separator.
o for copying from a remote rsync server to the local machine. This
is invoked when the source path contains a :: separator or a
rsync:// URL.
o for copying from the local machine to a remote rsync server. This
is invoked when the destination path contains a :: separator or a
rsync:// URL.
o for copying from a remote machine using a remote shell program as
the transport, using rsync server on the remote machine. This is
invoked when the source path contains a :: separator and the --
rsh=COMMAND (aka "-e COMMAND") option is also provided.
o for copying from the local machine to a remote machine using a
remote shell program as the transport, using rsync server on the
remote machine. This is invoked when the destination path
contains a :: separator and the --rsh=COMMMAND option is also
provided.
o for listing files on a remote machine. This is done the same way
as rsync transfers except that you leave off the local
destination.

July 10th, 2004, 11:49 PM

visual61

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hi did you find the code for identical files?

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