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Full Discussion: Password protection in unix
Top Forums Shell Programming and Scripting Password protection in unix Post 302572850 by cero on Friday 11th of November 2011 09:11:23 AM
Old 11-11-2011
It is more or less impossible to prevent a user one a remote system from opening a file you sent him.
Thats why encryption is used. Opening a file will not help an unauthorized user in any way as he is not able to interpret its content.
 

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cancel(1)							    Apple Inc.								 cancel(1)

NAME
cancel - cancel jobs SYNOPSIS
cancel [ -E ] [ -U username ] [ -a ] [ -h hostname[:port] ] [ -u username ] [ -x ] [ id ] [ destination ] [ destination-id ] DESCRIPTION
cancel cancels existing print jobs. The -a option will remove all jobs from the specified destination. OPTIONS
The following options are recognized by cancel: -E Forces encryption when connecting to the server. -U username Specifies the username to use when connecting to the server. -a Cancel all jobs on the named destination, or all jobs on all destinations if none is provided. -h hostname[:port] Chooses an alternate server. -u username Cancels jobs owned by username. -x Deletes job data files in addition to canceling. COMPATIBILITY
Unlike the System V printing system, CUPS allows printer names to contain any printable character except SPACE, TAB, "/", or "#". Also, printer and class names are not case-sensitive. NOTES
Administrators wishing to prevent unauthorized cancellation of jobs via the -u option should require authentication for Cancel-Jobs opera- tions in cupsd.conf(5). SEE ALSO
lp(1), lpmove(8), lpstat(1), http://localhost:631/help COPYRIGHT
Copyright 2007-2013 by Apple Inc. 21 January 2013 CUPS cancel(1)
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