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Full Discussion: script providing input to application prompts
Top Forums Shell Programming and Scripting script providing input to application prompts Post 61792 by mitch8 on Tuesday 8th of February 2005 05:53:09 PM
Old 02-08-2005
script providing input to application prompts
Hi!

I want to write a script that will create an archive (via tar) that will restrict the size of the tar file. The size can be constrained using the keyword 'k' and providing the size restriction. The problem is that the script needs to know (detect) when the tar command prompts the user (which will be this script) so that the script can copy the tar file to a temporary file (like tarFileName.1) and then return control back to the tar command to create the next volume.

(hope you could follow that logic)

My problem is I know of no mechanism in scripting in unix that allows for this kind of command flow control. Does it exist? Can anyone suggest a method I can use for this? (interrupt handlers; subs; ....)

tia,
mitch

ps the reason for needing to limit the size is to allow a customer to ftp some huge subdirectories (>10Gb) in bitesize pieces. The script will first gzip all the files, then archive them into volumes of, say, 100Mb in size. But the tar command prompts the user to change the archive media and hit RETURN to continue. The operator needs to copy the tar file to some other file, then hit return for this method to work.
 

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LEARN ABOUT CENTOS

bf_tar

BF_TAR(1)						    Bogofilter Reference Manual 						 BF_TAR(1)

NAME

       bf_tar - shell script to write a tar file of a bogofilter directory to stdout

SYNOPSIS

       bf_tar [-r] [-R] bogofilter_directory

DESCRIPTION

       bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
       EXAMPLES below).

OPTIONS

       The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
       files.

       The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
       is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files.

EXIT STATUS

       The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.

EXAMPLES

       o   bf_tar ~/.bogofilter > outfile.tar

	   Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.

       o   bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz

	   Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.

       o   bf_tar `pwd`/mydirectory > outfile.tar

	   Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.

NOTES

       This script is meant for use with Berkeley DB based bogofilter versions.

       This script requires a SUSv2 compliant pax utility.

       This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so
       that /usr/xpg4/bin/sh can be used.

AUTHORS

       Matthias Andree

Bogofilter							    10/22/2012								 BF_TAR(1)
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