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Full Discussion: Continuous log file transfer to remote server
Top Forums Shell Programming and Scripting Continuous log file transfer to remote server Post 302529194 by Corona688 on Wednesday 8th of June 2011 06:27:54 PM
Old 06-08-2011
Checking when a file is closed means busting out strange applications like fuser or lsof. Why not just watch for when a newer one is created? Some silly pseudocode:
Code:
last_updated=$(ls --sort=time /path/to/log | head -n 1)

while true
do
        ls --sort=time /path/to/log > /tmp/$$
        read latest < /tmp/$$
        if [ ! "$latest" = "$last_updated" ]
        then
                new="$latest"
                exec 5</tmp/$$
                # Skip the file being written to
                read latest <&5
                read latest <&5
                while [ ! "$latest" = "$last_updated" ]
                do
                        cp "$latest" /wherever
                        read latest <&5
                done
                exec 5<&-

                cp "$last_updated" /wherever
                last_updated="$new"
        else
                sleep 1
        fi        
done

You could potentially make it much smarter, not needing to run ls repeatedly and all that, by knowing more about the pattern this thing creates logfiles in.

You could also use NFS or somesuch to have the server create the files on the other machine in the first place, instead of having to continuously watch and copy.
 

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LEARN ABOUT ULTRIX

nfs

nfs(5nfs)																 nfs(5nfs)

Name
       nfs - Network File System

Description
       The Network File System (NFS) is a specific file system implemented under the Generic File System Interface, as described in

       NFS  provides  support  for sharing ordinary files and directories in a multivendor networking environment.  The system administrator for a
       file server machine makes a file system available for remote access by placing the name of the file system to be shared in an export  list.
       The  administrator for a client machine can import a file system from any server machine that has granted access permission to the request-
       ing client machine.  A complete exported file system or any subtree of an exported file system can be imported by the client machine.  Once
       imported, users on the client machine can access files in the remote file system as though they were local files.

See Also
       getdirentries(2), getmnt(2), mount(2nfs), mount(2), exports(5nfs), fstab(5), gfsi(5), mount(8nfs), showmount(8nfs)

																	 nfs(5nfs)
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