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Full Discussion: Generating files of specific size
Top Forums Shell Programming and Scripting Generating files of specific size Post 302077841 by blowtorch on Monday 26th of June 2006 10:19:51 PM
Old 06-26-2006
It depends on where you want to add the filename in the output file, but look at this:
Code:
#!/bin/ksh

awk -F/ '{print $1,$2,$3}' os_listing.out | while read filesize dirname filename; do
        mkdir $dirname
        cd $dirname
        echo $filename $filesize > $filename
        count=$(($filesize-${#filename}))
        dd if=/tmp/inputfile of=$filename bs=1 count=$count seek=${#filename}
        cd ..
done

This code adds the filename to the beginning of the file and then appends (count-length_of_filename) characters from the input file.
 

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LEARN ABOUT DEBIAN

tinydyndns-conf

tinydyndns-conf(8)					      System Manager's Manual						tinydyndns-conf(8)

NAME

       tinydyndns-conf - sets up a pop-before-dyndns service

SYNOPSIS

       tinydyndns-conf acct logacct dir myip mydomain

DESCRIPTION

       tinydyndns-conf	creates a service directory dir that runs tinydns(8), and a service directory dir/pop that runs a pop3 service and updates
       tinydns' database after a successful login.

       You can run the services under svscan(8) or runsvdir(8) by creating symbolic links in the /service directory:

	 ln -s dir /service/dir
	 ln -s dir/pop /service/dir-pop

       The service will start within five seconds, and will be restarted upon reboot.  You can use svc(8) to control the service.

       tinydyndns-conf runs

       tinydns-conf acct logacct dir myip

       to set up a DNS publication service.

       tinydyndns-conf modifies dir/root/Makefile to not run tinydns-data(8) upon normal request.

       tinydyndns-conf arranges for tcpserver(1) to listen on TCP port 110, and to start pop3front-auth(8), cvm-pwfile(8), and after a	successful
       login tinydyndns-update(8), and pop3front-maildir(8) upon connections.

       tinydyndns-conf creates a setpasswd script and a default passwd database in dir/pop for the use with cvm-pwfile(8).

SEE ALSO

       tinydyndns-update(8), tinydyndns-data(8), tinydns(8), tcpserver(1), pop3front-auth(8), cvm-pwfile(8), pop3front-maildir(8)

       http://smarden.org/tinydyndns/

AUTHOR

       Gerrit Pape <pape@smarden.org>

																tinydyndns-conf(8)
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