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Top Forums Shell Programming and Scripting Building JSON command with bash script Post 303039241 by Chubler_XL on Thursday 26th of September 2019 07:57:09 PM
Old 09-26-2019
Quote:
Originally Posted by psysc0rpi0n
Ok, I'm going to try your examples. This is not trivial for a starter. I've just been reading but not practicing much, so this is not clear at first sight!

--- Post updated at 10:02 PM ---



I don't fully understand what you mean by:


and
.

I need to read about expansions!
Fortunately this stuff is pretty well documented. I'd start with Shell Expansions, it's probably best while reading this to have a shell handy and try out the different expansions/substitutions mentioned with something like the pparm script posted above. Ensure you understand why they shell works the way it does.

For example word splitting occurs before pathname expansion, so when a file containing white space is expanded it wont be split.
Parameter and variable expansion occurs before word splitting so variables with white spaces are split:

Code:
$ ls
 jason_expand   pparm  'test with space'
$ ./pparm test*
Param 1: test with space
$ VAR="test with space"
$ ./pparm $VAR
Param 1: test
Param 2: with
Param 3: space
$ VAR=test
$ ./pparm ${VAR}*
<work thru the manual and decide what will happen here before trying it>


Last edited by Chubler_XL; 09-26-2019 at 09:04 PM..
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Jifty::Param(3pm)					User Contributed Perl Documentation					 Jifty::Param(3pm)

NAME
Jifty::Param - Parameters for Jifty actions DESCRIPTION
Describes a parameter to a "Jifty::Action" object. Do not construct this by hand -- use Jifty::Param::Schema in the action package to declare parameters instead. accessors Although this class is not derived from Jifty::Web::Form::Field, it does share the accessors from it; see Jifty::Web::Form::Field, for the list of possible keys that each parameter can have. In addition to the list there, you may use these additional keys: constructor A boolean which, if set, indicates that the argument must be present in the "arguments" passed to create the action, rather than being expected to be set later. Defaults to false. valid_values An array reference. Each element should be either: o A hash reference with a "display" field for the string to display for the value, and a "value" field for the value to actually send to the server. o A hash reference with a "collection" field containing a Jifty::Collection, and "display_from" and "value_from" fields containing the names of methods to call on each record in the collection to get "display" and "value". o A simple string, which is treated as both "display" and "value". available_values Just like valid_values, but represents the list of suggested values, instead of the list of acceptable values. sort_order An integer of how the parameter sorts relative to other parameters. This is usually implicitly generated by its declaration order. new Creates a new Jifty::Param object. Note that unlike Jifty::Web::Form::Field, the object is never magically reblessed into a subclass. Should only be called implicitly from a Jifty::Param::Schema declaration. perl v5.14.2 2010-09-25 Jifty::Param(3pm)
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