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Full Discussion: Input validation ?
Top Forums Shell Programming and Scripting Input validation ? Post 302069486 by vino on Monday 27th of March 2006 02:51:33 AM
Old 03-27-2006
if [ !z "$PACKAGE" ]

Was that a typo ? If yes, try if [ -z "$PACKAGE" ]
 

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VIPS(1) 						      General Commands Manual							   VIPS(1)

NAME
vips - run vips operations from the command line SYNOPSIS
vips [options] [command] [command-options] [command-args] DESCRIPTION
vips(1) is the VIPS universal main program. You can use it to run any VIPS operation from the command line, to query the VIPS function database, and to maintain parts of the VIPS library. To run a VIPS function, the first argument should be the name of the function and following arguments should be the function parameters. For example: $ vips im_invert lena.v lena2.v OPTIONS
-p PLUGIN, --plugin=PLUGIN Load PLUGIN. Note that plugins in $VIPSHOME/lib are loaded automatically. -v, --version Show VIPS version. COMMANDS
list PACKAGE List operations defined in PACKAGE. PACKAGE can also be "classes", "packages" or "all". cpph PACKAGE Print C++ header for PACKAGE. PACKAGE can also be a function name, or "all". cppc PACKAGE Print C++ binding for PACKAGE. PACKAGE can also be a function name, or "all". operation-name operation-arguments Execute a named operation, for example im_invert, or add. Names prefixed with "im_" are called via the vips7 interface, names with- out the prefix use the new vips8 interface. EXAMPLES
Run a vips7 operation. The vips7 interface does not suport optional arguments. $ vips im_invert lena.v lena2.v Run a vips8 operation. Operation options must follow the operation name. $ vips add --imtest=option.jpg lena.v lena2.v out.v Get a "usage" message for an operation $ vips add VipsAdd (add), add two images add left right out where: left :: VipsImage (input) right :: VipsImage (input) out :: VipsImage (output) optional arguments: imtest :: VipsImage (input) booltest :: gboolean (input) RETURN VALUE
returns 0 on success and non-zero on error. SEE ALSO
header(1) COPYRIGHT
The National Gallery and Birkbeck College, 1989-1996. 30 June 1993 VIPS(1)
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